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    <title>UI框架</title>
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<body class='typora-export'>
<div class='typora-export-content'>
    <div id='write' class=''><h3 id='一选择题'><span>一、选择题</span></h3><h4 id='1刷新当前页面的方法'><span>1、刷新当前页面的方法。</span></h4>
        <pre class="md-fences md-end-block md-fences-with-lineno ty-contain-cm modeLoaded" spellcheck="false"
             lang="css"><div class="CodeMirror cm-s-inner cm-s-null-scroll CodeMirror-wrap" lang="css"><div
                style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 10.5px; left: 37px;"><textarea
                autocorrect="off" autocapitalize="off" spellcheck="false" tabindex="0"
                style="position: absolute; bottom: -1em; padding: 0px; width: 1000px; height: 1em; outline: none;"></textarea></div><div
                class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div class="CodeMirror-gutter-filler"
                                                                                     cm-not-content="true"></div><div
                class="CodeMirror-scroll" tabindex="-1"><div class="CodeMirror-sizer"
                                                             style="margin-left: 29px; margin-bottom: 0px; border-right-width: 0px; padding-right: 0px; padding-bottom: 0px;"><div
                style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div
                role="presentation" style="position: relative; outline: none;"><div class="CodeMirror-measure"></div><div
                class="CodeMirror-measure"></div><div style="position: relative; z-index: 1;"></div><div
                class="CodeMirror-code" role="presentation" style=""><div class="CodeMirror-activeline"
                                                                          style="position: relative;"><div
                class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div
                class="CodeMirror-gutter-background CodeMirror-activeline-gutter"
                style="left: -29px; width: 29px;"></div><div
                class="CodeMirror-gutter-wrapper CodeMirror-activeline-gutter" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 20px;">1</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;">&lt;<span class="cm-tag">meta</span> <span
                class="cm-tag">http-equiv</span>=<span class="cm-string">"refresh"</span> <span
                class="cm-tag">content</span>=<span class="cm-string">"20"</span>&gt;</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">2</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span class="cm-tag">history</span><span
                class="cm-qualifier">.go</span>(<span class="cm-number">0</span>)</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">3</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span class="cm-tag">location</span><span
                class="cm-qualifier">.reload</span>()</span></pre></div><div style="position: relative;"><div
                class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">4</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span class="cm-tag">location</span>=<span
                class="cm-tag">location</span></span></pre></div><div style="position: relative;"><div
                class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">5</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span class="cm-tag">location</span><span
                class="cm-qualifier">.assign</span>(<span class="cm-tag">location</span>)</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">6</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span class="cm-tag">document</span><span
                class="cm-qualifier">.execCommand</span>(<span class="cm-string">'Refresh'</span>)</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">7</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span class="cm-tag">window</span><span
                class="cm-qualifier">.navigate</span>(<span class="cm-tag">location</span>)</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">8</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span class="cm-tag">location</span><span
                class="cm-qualifier">.replace</span>(<span class="cm-tag">location</span>)</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 20px;">9</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;"><span class="cm-tag">document</span><span
                class="cm-qualifier">.URL</span>=<span class="cm-tag">location</span><span
                class="cm-qualifier">.href</span></span></pre></div></div></div></div></div></div><div
                style="position: absolute; height: 0px; width: 1px; border-bottom-width: 0px; border-bottom-style: solid; border-bottom-color: transparent; top: 225px;"></div><div
                class="CodeMirror-gutters" style="height: 225px;"><div class="CodeMirror-gutter CodeMirror-linenumbers"
                                                                       style="width: 28px;"></div></div></div></div></pre>
        <h4 id='2javascript中将数组转化成字符串的三种方法'><span>2、JavaScript中，将数组转化成字符串的三种方法。</span></h4>
        <pre class="md-fences md-end-block md-fences-with-lineno ty-contain-cm modeLoaded" spellcheck="false" lang="js"><div
                class="CodeMirror cm-s-inner cm-s-null-scroll CodeMirror-wrap" lang="js"><div
                style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 10.5px; left: 37px;"><textarea
                autocorrect="off" autocapitalize="off" spellcheck="false" tabindex="0"
                style="position: absolute; bottom: -1em; padding: 0px; width: 1000px; height: 1em; outline: none;"></textarea></div><div
                class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div class="CodeMirror-gutter-filler"
                                                                                     cm-not-content="true"></div><div
                class="CodeMirror-scroll" tabindex="-1"><div class="CodeMirror-sizer"
                                                             style="margin-left: 29px; margin-bottom: 0px; border-right-width: 0px; padding-right: 0px; padding-bottom: 0px;"><div
                style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div
                role="presentation" style="position: relative; outline: none;"><div class="CodeMirror-measure"><pre><span>xxxxxxxxxx</span></pre><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt"><div>7</div></div></div><div
                class="CodeMirror-measure"></div><div style="position: relative; z-index: 1;"></div><div
                class="CodeMirror-code" role="presentation" style=""><div class="CodeMirror-activeline"
                                                                          style="position: relative;"><div
                class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div
                class="CodeMirror-gutter-background CodeMirror-activeline-gutter"
                style="left: -29px; width: 29px;"></div><div
                class="CodeMirror-gutter-wrapper CodeMirror-activeline-gutter" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 20px;">1</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;"><span class="cm-keyword">var</span> <span
                class="cm-def">a</span> <span class="cm-operator">=</span> [<span class="cm-number">1</span>,<span
                class="cm-number">2</span>,<span class="cm-number">3</span>,<span class="cm-number">4</span>,<span
                class="cm-number">5</span>];</span></pre></div><div style="position: relative;"><div
                class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">2</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span
                class="cm-comment">// 1、toString() 将数组转换成一个字符串</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">3</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span
                class="cm-keyword">var</span> <span class="cm-def">s1</span> <span class="cm-operator">=</span> <span
                class="cm-variable">a</span>.<span class="cm-property">toString</span>();</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">4</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span
                class="cm-comment">// 2、toLocaleString 将数组转换为本地约定的字符串</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">5</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span
                class="cm-keyword">var</span> <span class="cm-def">s2</span> <span class="cm-operator">=</span> <span
                class="cm-variable">a</span>.<span class="cm-property">toLocaleString</span>();</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">6</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span
                class="cm-comment">// 3、join() 将数组元素使用括号中的元素连接起来，构成一个字符串</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 20px;">7</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;"><span class="cm-keyword">var</span> <span
                class="cm-def">s3</span> <span class="cm-operator">=</span> <span class="cm-variable">a</span>.<span
                class="cm-property">join</span>(<span
                class="cm-string">'-'</span>);</span></pre></div></div></div></div></div></div><div
                style="position: absolute; height: 0px; width: 1px; border-bottom-width: 0px; border-bottom-style: solid; border-bottom-color: transparent; top: 175px;"></div><div
                class="CodeMirror-gutters" style="height: 175px;"><div class="CodeMirror-gutter CodeMirror-linenumbers"
                                                                       style="width: 28px;"></div></div></div></div></pre>
        <h4 id='3h5数据存储是同步还是异步的'><span>3、H5数据存储是同步还是异步的？</span></h4>
        <pre class="md-fences md-end-block md-fences-with-lineno ty-contain-cm modeLoaded" spellcheck="false" lang="te"><div
                class="CodeMirror cm-s-inner cm-s-null-scroll CodeMirror-wrap" lang="te"><div
                style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 10.5px; left: 37px;"><textarea
                autocorrect="off" autocapitalize="off" spellcheck="false" tabindex="0"
                style="position: absolute; bottom: -1em; padding: 0px; width: 1000px; height: 1em; outline: none;"></textarea></div><div
                class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div class="CodeMirror-gutter-filler"
                                                                                     cm-not-content="true"></div><div
                class="CodeMirror-scroll" tabindex="-1"><div class="CodeMirror-sizer"
                                                             style="margin-left: 29px; margin-bottom: 0px; border-right-width: 0px; padding-right: 0px; padding-bottom: 0px;"><div
                style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div
                role="presentation" style="position: relative; outline: none;"><div class="CodeMirror-measure"><pre><span>xxxxxxxxxx</span></pre><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt"><div>1</div></div></div><div
                class="CodeMirror-measure"></div><div style="position: relative; z-index: 1;"></div><div
                class="CodeMirror-code" role="presentation"><div class="CodeMirror-activeline"
                                                                 style="position: relative;"><div
                class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div
                class="CodeMirror-gutter-background CodeMirror-activeline-gutter"
                style="left: -29px; width: 29px;"></div><div
                class="CodeMirror-gutter-wrapper CodeMirror-activeline-gutter" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 20px;">1</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;">H5数据存储是同步的。</span></pre></div></div></div></div></div></div><div
                style="position: absolute; height: 0px; width: 1px; border-bottom-width: 0px; border-bottom-style: solid; border-bottom-color: transparent; top: 25px;"></div><div
                class="CodeMirror-gutters" style="height: 25px;"><div class="CodeMirror-gutter CodeMirror-linenumbers"
                                                                      style="width: 28px;"></div></div></div></div></pre>
        <h4 id='4indexdb数据库是如何来存储数据的'><span>4、IndexDB数据库是如何来存储数据的？</span></h4>
        <pre class="md-fences md-end-block md-fences-with-lineno ty-contain-cm modeLoaded" spellcheck="false"
             lang="tex"><div class="CodeMirror cm-s-inner cm-s-null-scroll CodeMirror-wrap" lang="tex"><div
                style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 10.5px; left: 37px;"><textarea
                autocorrect="off" autocapitalize="off" spellcheck="false" tabindex="0"
                style="position: absolute; bottom: -1em; padding: 0px; width: 1000px; height: 1em; outline: none;"></textarea></div><div
                class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div class="CodeMirror-gutter-filler"
                                                                                     cm-not-content="true"></div><div
                class="CodeMirror-scroll" tabindex="-1"><div class="CodeMirror-sizer"
                                                             style="margin-left: 29px; margin-bottom: 0px; border-right-width: 0px; padding-right: 0px; padding-bottom: 0px;"><div
                style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div
                role="presentation" style="position: relative; outline: none;"><div class="CodeMirror-measure"><pre><span>xxxxxxxxxx</span></pre><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt"><div>5</div></div></div><div
                class="CodeMirror-measure"></div><div style="position: relative; z-index: 1;"></div><div
                class="CodeMirror-code" role="presentation" style=""><div class="CodeMirror-activeline"
                                                                          style="position: relative;"><div
                class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div
                class="CodeMirror-gutter-background CodeMirror-activeline-gutter"
                style="left: -29px; width: 29px;"></div><div
                class="CodeMirror-gutter-wrapper CodeMirror-activeline-gutter" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 20px;">1</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;">打开数据库并且开始一个事务。</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">2</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;">创建一个对象仓库(Object Store)。</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">3</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;">构建一个请求来执行一些数据库操作，例如增加或提取数据等。</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">4</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;">通过监听正确类型的DOM事件以等待操作完成。</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 20px;">5</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation"
                style="padding-right: 0.1px;">在操作结果上进行一些操作（可以在request对象中找到）。</span></pre></div></div></div></div></div></div><div
                style="position: absolute; height: 0px; width: 1px; border-bottom-width: 0px; border-bottom-style: solid; border-bottom-color: transparent; top: 125px;"></div><div
                class="CodeMirror-gutters" style="height: 125px;"><div class="CodeMirror-gutter CodeMirror-linenumbers"
                                                                       style="width: 28px;"></div></div></div></div></pre>
        <h4 id='5sessionstoragekeyindex-方法的作用'><span>5、sessionStorage.key(index) 方法的作用。</span></h4>
        <pre class="md-fences md-end-block md-fences-with-lineno ty-contain-cm modeLoaded" spellcheck="false" lang="js"><div
                class="CodeMirror cm-s-inner cm-s-null-scroll CodeMirror-wrap" lang="js"><div
                style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 10.25px; left: 37px;"><textarea
                autocorrect="off" autocapitalize="off" spellcheck="false" tabindex="0"
                style="position: absolute; bottom: -1em; padding: 0px; width: 1000px; height: 1em; outline: none;"></textarea></div><div
                class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div class="CodeMirror-gutter-filler"
                                                                                     cm-not-content="true"></div><div
                class="CodeMirror-scroll" tabindex="-1"><div class="CodeMirror-sizer"
                                                             style="margin-left: 29px; margin-bottom: 0px; border-right-width: 0px; padding-right: 0px; padding-bottom: 0px;"><div
                style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div
                role="presentation" style="position: relative; outline: none;"><div
                class="CodeMirror-measure"><span><span>​</span>x</span></div><div class="CodeMirror-measure"></div><div
                style="position: relative; z-index: 1;"></div><div class="CodeMirror-code" role="presentation" style=""><div
                class="CodeMirror-activeline" style="position: relative;"><div
                class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div
                class="CodeMirror-gutter-background CodeMirror-activeline-gutter"
                style="left: -29px; width: 29px;"></div><div
                class="CodeMirror-gutter-wrapper CodeMirror-activeline-gutter" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 20px;">1</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;"><span class="cm-variable">key</span>() <span
                class="cm-variable">作为</span> <span class="cm-variable">Storage</span> <span class="cm-variable">接口的方法，接受一个数值</span> <span
                class="cm-variable">n</span> <span class="cm-variable">作为参数，返回存储对象第</span> <span
                class="cm-variable">n</span> <span
                class="cm-variable">个数据项的键名。键的存储顺序是由用户代理定义的，所以尽可能不要依赖这个方法。</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">2</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span cm-text=""
                                                                                                        cm-zwsp="">
</span></span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">3</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span
                class="cm-keyword">function</span> <span class="cm-def">populateStorage</span>() {</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">4</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp;<span
                class="cm-variable">localStorage</span>.<span class="cm-property">setItem</span>(<span
                class="cm-string">'bgcolor'</span>, <span class="cm-string">'yellow'</span>);</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">5</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp;<span
                class="cm-variable">localStorage</span>.<span class="cm-property">setItem</span>(<span
                class="cm-string">'font'</span>, <span class="cm-string">'Helvetica'</span>);</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">6</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp;<span
                class="cm-variable">localStorage</span>.<span class="cm-property">setItem</span>(<span
                class="cm-string">'image'</span>, <span class="cm-string">'cats.png'</span>);</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">7</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp;</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">8</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp;<span
                class="cm-variable">localStorage</span>.<span class="cm-property">key</span>(<span
                class="cm-number">2</span>); <span class="cm-comment">// 应该返回 'image'</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 20px;">9</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;">}</span></pre></div></div></div></div></div></div><div
                style="position: absolute; height: 0px; width: 1px; border-bottom-width: 0px; border-bottom-style: solid; border-bottom-color: transparent; top: 250px;"></div><div
                class="CodeMirror-gutters" style="height: 250px;"><div class="CodeMirror-gutter CodeMirror-linenumbers"
                                                                       style="width: 28px;"></div></div></div></div></pre>
        <h4 id='6settimeoutsetlnterval-函数语法意义'><span>6、setTimeout()、setlnterval() 函数语法、意义。</span></h4>
        <pre class="md-fences md-end-block md-fences-with-lineno ty-contain-cm modeLoaded" spellcheck="false" lang="js"><div
                class="CodeMirror cm-s-inner cm-s-null-scroll CodeMirror-wrap" lang="js"><div
                style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 10.5px; left: 37px;"><textarea
                autocorrect="off" autocapitalize="off" spellcheck="false" tabindex="0"
                style="position: absolute; bottom: -1em; padding: 0px; width: 1000px; height: 1em; outline: none;"></textarea></div><div
                class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div class="CodeMirror-gutter-filler"
                                                                                     cm-not-content="true"></div><div
                class="CodeMirror-scroll" tabindex="-1"><div class="CodeMirror-sizer"
                                                             style="margin-left: 29px; margin-bottom: 0px; border-right-width: 0px; padding-right: 0px; padding-bottom: 0px;"><div
                style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div
                role="presentation" style="position: relative; outline: none;"><div class="CodeMirror-measure"><pre><span>xxxxxxxxxx</span></pre><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt"><div>5</div></div></div><div
                class="CodeMirror-measure"></div><div style="position: relative; z-index: 1;"></div><div
                class="CodeMirror-code" role="presentation" style=""><div class="CodeMirror-activeline"
                                                                          style="position: relative;"><div
                class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div
                class="CodeMirror-gutter-background CodeMirror-activeline-gutter"
                style="left: -29px; width: 29px;"></div><div
                class="CodeMirror-gutter-wrapper CodeMirror-activeline-gutter" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 20px;">1</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;"><span class="cm-variable">setTimeout</span>()<span
                class="cm-variable">方法设置一个定时器，该定时器在定时器到期后执行一个函数或指定的一段代码。</span> </span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">2</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span
                class="cm-keyword">var</span> <span class="cm-def">timeoutID</span> <span
                class="cm-operator">=</span> <span class="cm-variable">setTimeout</span>(<span class="cm-keyword">function</span>[, <span
                class="cm-variable">delay</span>]);<span class="cm-tab" role="presentation"
                                                         cm-text="	">  </span><span class="cm-comment">// delay：默认值为0。</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">3</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span cm-text=""
                                                                                                        cm-zwsp="">
</span></span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">4</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span
                class="cm-variable">setInterval</span>()<span
                class="cm-variable">方法重复调用一个函数或执行一个代码段，在每次调用之间具有固定的时间延迟。</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 20px;">5</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;"><span class="cm-keyword">var</span> <span
                class="cm-def">intervalID</span> <span class="cm-operator">=</span> <span class="cm-variable">setInterval</span>(<span
                class="cm-variable">func</span>, <span class="cm-variable">delay</span>, [<span
                class="cm-variable">arg1</span>, <span class="cm-variable">arg2</span>, <span class="cm-meta">...</span>]);</span></pre></div></div></div></div></div></div><div
                style="position: absolute; height: 0px; width: 1px; border-bottom-width: 0px; border-bottom-style: solid; border-bottom-color: transparent; top: 125px;"></div><div
                class="CodeMirror-gutters" style="height: 125px;"><div class="CodeMirror-gutter CodeMirror-linenumbers"
                                                                       style="width: 28px;"></div></div></div></div></pre>
        <p><strong><span>7、Canvas的API 常用方法。</span></strong></p>
        <pre class="md-fences md-end-block md-fences-with-lineno ty-contain-cm modeLoaded" spellcheck="false"
             lang="html" style="break-inside: unset;"><div
                class="CodeMirror cm-s-inner cm-s-null-scroll CodeMirror-wrap" lang="html"><div
                style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 10.5px; left: 46px;"><textarea
                autocorrect="off" autocapitalize="off" spellcheck="false" tabindex="0"
                style="position: absolute; bottom: -1em; padding: 0px; width: 1000px; height: 1em; outline: none;"></textarea></div><div
                class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div class="CodeMirror-gutter-filler"
                                                                                     cm-not-content="true"></div><div
                class="CodeMirror-scroll" tabindex="-1"><div class="CodeMirror-sizer"
                                                             style="margin-left: 38px; margin-bottom: 0px; border-right-width: 0px; padding-right: 0px; padding-bottom: 0px;"><div
                style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div
                role="presentation" style="position: relative; outline: none;"><div class="CodeMirror-measure"><pre><span>xxxxxxxxxx</span></pre><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt"><div>25</div></div></div><div
                class="CodeMirror-measure"></div><div style="position: relative; z-index: 1;"></div><div
                class="CodeMirror-code" role="presentation" style=""><div class="CodeMirror-activeline"
                                                                          style="position: relative;"><div
                class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div
                class="CodeMirror-gutter-background CodeMirror-activeline-gutter"
                style="left: -38px; width: 38px;"></div><div
                class="CodeMirror-gutter-wrapper CodeMirror-activeline-gutter" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 29px;">1</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;"><span class="cm-tag cm-bracket">&lt;</span><span
                class="cm-tag">canvas</span> <span class="cm-attribute">id</span>=<span
                class="cm-string">"tutorial"</span> <span class="cm-attribute">width</span>=<span class="cm-string">"150"</span> <span
                class="cm-attribute">height</span>=<span class="cm-string">"150"</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">2</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;">  当前浏览器不支持canvas！</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">3</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span
                class="cm-tag cm-bracket">&lt;/</span><span class="cm-tag">canvas</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">4</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span cm-text=""
                                                                                                        cm-zwsp="">
</span></span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">5</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span
                class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">script</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">6</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-keyword">var</span> <span class="cm-def">canvas</span> <span
                class="cm-operator">=</span> <span class="cm-variable">document</span>.<span class="cm-property">getElementById</span>(<span
                class="cm-string">'tutorial'</span>);</span></pre></div><div style="position: relative;"><div
                class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">7</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-keyword">var</span> <span class="cm-def">ctx</span> <span class="cm-operator">=</span> <span
                class="cm-variable">canvas</span>.<span class="cm-property">getContext</span>(<span class="cm-string">'2d'</span>);</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">8</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">9</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-comment">// 绘制矩形</span></span></pre></div><div style="position: relative;"><div
                class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 29px;">10</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-variable">ctx</span>.<span class="cm-property">rect</span>(<span class="cm-variable">x</span>, <span
                class="cm-variable">y</span>, <span class="cm-variable">width</span>, <span
                class="cm-variable">height</span>);</span></pre></div><div style="position: relative;"><div
                class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">11</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-variable">ctx</span>.<span class="cm-property">fillRect</span>(<span
                class="cm-variable">x</span>, <span class="cm-variable">y</span>, <span class="cm-variable">width</span>, <span
                class="cm-variable">height</span>)<span class="cm-variable">；</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">12</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-variable">ctx</span>.<span class="cm-property">strokeRect</span>(<span
                class="cm-variable">x</span>, <span class="cm-variable">y</span>, <span class="cm-variable">width</span>, <span
                class="cm-variable">height</span>);</span></pre></div><div style="position: relative;"><div
                class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">13</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-variable">ctx</span>.<span class="cm-property">clearRect</span>(<span
                class="cm-variable">x</span>, <span class="cm-variable">y</span>, <span class="cm-variable">width</span>, <span
                class="cm-variable">height</span>);</span></pre></div><div style="position: relative;"><div
                class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">14</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-comment">// 绘制路径</span></span></pre></div><div style="position: relative;"><div
                class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">15</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-variable">ctx</span>.<span class="cm-property">beginPath</span>();</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">16</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-variable">ctx</span>.<span class="cm-property">moveTo</span>();<span class="cm-tab"
                                                                                               role="presentation"
                                                                                               cm-text="	">   </span><span
                class="cm-comment">// 移动笔触</span></span></pre></div><div style="position: relative;"><div
                class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">17</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-variable">ctx</span>.<span class="cm-property">lineTo</span>();<span class="cm-tab"
                                                                                               role="presentation"
                                                                                               cm-text="	">   </span><span
                class="cm-comment">// 绘制直线</span></span></pre></div><div style="position: relative;"><div
                class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">18</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-variable">ctx</span>.<span class="cm-property">arc</span>(<span class="cm-variable">x</span>, <span
                class="cm-variable">y</span>, <span class="cm-variable">radius</span>, <span class="cm-variable">startAngle</span>, <span
                class="cm-variable">endAngle</span>, <span class="cm-variable">anticlockwise</span>);<span
                class="cm-tab" role="presentation" cm-text="	"> </span><span class="cm-comment">// 绘制圆弧</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">19</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-variable">ctx</span>.<span class="cm-property">closePath</span>();</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 29px;">20</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-variable">ctx</span>.<span class="cm-property">stroke</span>();<span class="cm-tab"
                                                                                               role="presentation"
                                                                                               cm-text="	">   </span><span
                class="cm-comment">// 轮廓</span></span></pre></div><div style="position: relative;"><div
                class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">21</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-variable">ctx</span>.<span class="cm-property">fill</span>();<span class="cm-tab"
                                                                                             role="presentation"
                                                                                             cm-text="	"> </span><span
                class="cm-comment">// 填充</span></span></pre></div><div style="position: relative;"><div
                class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">22</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-comment">// 贝塞尔曲线</span></span></pre></div><div style="position: relative;"><div
                class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">23</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-variable">ctx</span>.<span class="cm-property">quadraticCurveTo</span>(<span
                class="cm-variable">cp1x</span>, <span class="cm-variable">cp1y</span>, <span
                class="cm-variable">x</span>, <span class="cm-variable">y</span>);<span class="cm-tab"
                                                                                        role="presentation"
                                                                                        cm-text="	"> </span><span
                class="cm-comment">// 二次贝塞尔</span></span></pre></div><div style="position: relative;"><div
                class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">24</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-variable">ctx</span>.<span class="cm-property">bezierCurveTo</span>(<span class="cm-variable">cp1x</span>, <span
                class="cm-variable">cp1y</span>, <span class="cm-variable">cp2x</span>, <span
                class="cm-variable">cp2y</span>, <span class="cm-variable">x</span>, <span class="cm-variable">y</span>);<span
                class="cm-tab" role="presentation" cm-text="	">    </span><span
                class="cm-comment">// 三次贝塞尔</span></span></pre></div><div style="position: relative;"><div
                class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 29px;">25</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;"><span class="cm-tag cm-bracket">&lt;/</span><span
                class="cm-tag">script</span><span
                class="cm-tag cm-bracket">&gt;</span></span></pre></div></div></div></div></div></div><div
                style="position: absolute; height: 0px; width: 1px; border-bottom-width: 0px; border-bottom-style: solid; border-bottom-color: transparent; top: 625px;"></div><div
                class="CodeMirror-gutters" style="height: 625px;"><div class="CodeMirror-gutter CodeMirror-linenumbers"
                                                                       style="width: 37px;"></div></div></div></div></pre>
        <h4 id='8canvas中用于绘制已定义的路径应的方法'><span>8、Canvas中用于绘制已定义的路径应的方法。</span></h4>
        <pre class="md-fences md-end-block md-fences-with-lineno ty-contain-cm modeLoaded" spellcheck="false"
             lang="tex"><div class="CodeMirror cm-s-inner cm-s-null-scroll CodeMirror-wrap" lang="tex"><div
                style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 10.5px; left: 37px;"><textarea
                autocorrect="off" autocapitalize="off" spellcheck="false" tabindex="0"
                style="position: absolute; bottom: -1em; padding: 0px; width: 1000px; height: 1em; outline: none;"></textarea></div><div
                class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div class="CodeMirror-gutter-filler"
                                                                                     cm-not-content="true"></div><div
                class="CodeMirror-scroll" tabindex="-1"><div class="CodeMirror-sizer"
                                                             style="margin-left: 29px; margin-bottom: 0px; border-right-width: 0px; padding-right: 0px; padding-bottom: 0px;"><div
                style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div
                role="presentation" style="position: relative; outline: none;"><div class="CodeMirror-measure"><pre><span>xxxxxxxxxx</span></pre><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt"><div>4</div></div></div><div
                class="CodeMirror-measure"></div><div style="position: relative; z-index: 1;"></div><div
                class="CodeMirror-code" role="presentation"><div class="CodeMirror-activeline"
                                                                 style="position: relative;"><div
                class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div
                class="CodeMirror-gutter-background CodeMirror-activeline-gutter"
                style="left: -29px; width: 29px;"></div><div
                class="CodeMirror-gutter-wrapper CodeMirror-activeline-gutter" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 20px;">1</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;">beginPath()：用于新建一条路径，也是图形绘制的起点。</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">2</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;">closePath()：该方法用于闭合路径。当执行该方法时会从画笔的当前坐标位置绘制一条线段到初始坐标位置来闭合图形。</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">3</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;">stroke()：在图形轮廓勾勒完毕后需要执行该方法才能正式将路径渲染到画布上。</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 20px;">4</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation"
                style="padding-right: 0.1px;">fill()：可以使用该方法为图形填充颜色，生成实心的图形。</span></pre></div></div></div></div></div></div><div
                style="position: absolute; height: 0px; width: 1px; border-bottom-width: 0px; border-bottom-style: solid; border-bottom-color: transparent; top: 100px;"></div><div
                class="CodeMirror-gutters" style="height: 100px;"><div class="CodeMirror-gutter CodeMirror-linenumbers"
                                                                       style="width: 28px;"></div></div></div></div></pre>
        <h4 id='9canvas中怎样设置线性渐变'><span>9、Canvas中怎样设置线性渐变。</span></h4>
        <pre class="md-fences md-end-block md-fences-with-lineno ty-contain-cm modeLoaded" spellcheck="false" lang="js"><div
                class="CodeMirror cm-s-inner cm-s-null-scroll CodeMirror-wrap" lang="js"><div
                style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 10.5px; left: 37px;"><textarea
                autocorrect="off" autocapitalize="off" spellcheck="false" tabindex="0"
                style="position: absolute; bottom: -1em; padding: 0px; width: 1000px; height: 1em; outline: none;"></textarea></div><div
                class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div class="CodeMirror-gutter-filler"
                                                                                     cm-not-content="true"></div><div
                class="CodeMirror-scroll" tabindex="-1"><div class="CodeMirror-sizer"
                                                             style="margin-left: 29px; margin-bottom: 0px; border-right-width: 0px; padding-right: 0px; padding-bottom: 0px;"><div
                style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div
                role="presentation" style="position: relative; outline: none;"><div class="CodeMirror-measure"><pre><span>xxxxxxxxxx</span></pre><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt"><div>2</div></div></div><div
                class="CodeMirror-measure"></div><div style="position: relative; z-index: 1;"></div><div
                class="CodeMirror-code" role="presentation"><div class="CodeMirror-activeline"
                                                                 style="position: relative;"><div
                class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div
                class="CodeMirror-gutter-background CodeMirror-activeline-gutter"
                style="left: -29px; width: 29px;"></div><div
                class="CodeMirror-gutter-wrapper CodeMirror-activeline-gutter" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 20px;">1</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;"><span class="cm-comment">// (x1,y1)表示渐变的初始位置坐标，(x2,y2)表示渐变的结束位置坐标。 </span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 20px;">2</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;"><span class="cm-variable">ctx</span>.<span
                class="cm-property">createLinearGradient</span>(<span class="cm-variable">x1</span>, <span
                class="cm-variable">y1</span>, <span class="cm-variable">x2</span>, <span class="cm-variable">y2</span>);</span></pre></div></div></div></div></div></div><div
                style="position: absolute; height: 0px; width: 1px; border-bottom-width: 0px; border-bottom-style: solid; border-bottom-color: transparent; top: 50px;"></div><div
                class="CodeMirror-gutters" style="height: 50px;"><div class="CodeMirror-gutter CodeMirror-linenumbers"
                                                                      style="width: 28px;"></div></div></div></div></pre>
        <h4 id='10canvas绘图是借助javascript-脚本通过-）方法进行图形绘制'><span>10、Canvas绘图是借助JavaScript 脚本通过（ ）方法进行图形绘制。**</span></h4>
        <pre class="md-fences md-end-block md-fences-with-lineno ty-contain-cm modeLoaded" spellcheck="false"
             lang="tex"><div class="CodeMirror cm-s-inner cm-s-null-scroll CodeMirror-wrap" lang="tex"><div
                style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 10.5px; left: 37px;"><textarea
                autocorrect="off" autocapitalize="off" spellcheck="false" tabindex="0"
                style="position: absolute; bottom: -1em; padding: 0px; width: 1000px; height: 1em; outline: none;"></textarea></div><div
                class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div class="CodeMirror-gutter-filler"
                                                                                     cm-not-content="true"></div><div
                class="CodeMirror-scroll" tabindex="-1"><div class="CodeMirror-sizer"
                                                             style="margin-left: 29px; margin-bottom: 0px; border-right-width: 0px; padding-right: 0px; padding-bottom: 0px;"><div
                style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div
                role="presentation" style="position: relative; outline: none;"><div class="CodeMirror-measure"><pre><span>xxxxxxxxxx</span></pre><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt"><div>1</div></div></div><div
                class="CodeMirror-measure"></div><div style="position: relative; z-index: 1;"></div><div
                class="CodeMirror-code" role="presentation"><div class="CodeMirror-activeline"
                                                                 style="position: relative;"><div
                class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div
                class="CodeMirror-gutter-background CodeMirror-activeline-gutter"
                style="left: -29px; width: 29px;"></div><div
                class="CodeMirror-gutter-wrapper CodeMirror-activeline-gutter" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 20px;">1</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;">Canvas API 或 WebGL API </span></pre></div></div></div></div></div></div><div
                style="position: absolute; height: 0px; width: 1px; border-bottom-width: 0px; border-bottom-style: solid; border-bottom-color: transparent; top: 25px;"></div><div
                class="CodeMirror-gutters" style="height: 25px;"><div class="CodeMirror-gutter CodeMirror-linenumbers"
                                                                      style="width: 28px;"></div></div></div></div></pre>
        <h4 id='11在jquery中关于淡入淡出特效是通过方法实现的'><span>11、在jQuery中，关于淡入淡出特效是通过方法实现的</span></h4>
        <pre class="md-fences md-end-block md-fences-with-lineno ty-contain-cm modeLoaded" spellcheck="false" lang="js"><div
                class="CodeMirror cm-s-inner cm-s-null-scroll CodeMirror-wrap" lang="js"><div
                style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 10.5px; left: 37px;"><textarea
                autocorrect="off" autocapitalize="off" spellcheck="false" tabindex="0"
                style="position: absolute; bottom: -1em; padding: 0px; width: 1000px; height: 1em; outline: none;"></textarea></div><div
                class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div class="CodeMirror-gutter-filler"
                                                                                     cm-not-content="true"></div><div
                class="CodeMirror-scroll" tabindex="-1"><div class="CodeMirror-sizer"
                                                             style="margin-left: 29px; margin-bottom: 0px; border-right-width: 0px; padding-right: 0px; padding-bottom: 0px;"><div
                style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div
                role="presentation" style="position: relative; outline: none;"><div class="CodeMirror-measure"><pre><span>xxxxxxxxxx</span></pre><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt"><div>4</div></div></div><div
                class="CodeMirror-measure"></div><div style="position: relative; z-index: 1;"></div><div
                class="CodeMirror-code" role="presentation"><div class="CodeMirror-activeline"
                                                                 style="position: relative;"><div
                class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div
                class="CodeMirror-gutter-background CodeMirror-activeline-gutter"
                style="left: -29px; width: 29px;"></div><div
                class="CodeMirror-gutter-wrapper CodeMirror-activeline-gutter" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 20px;">1</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;"><span class="cm-variable">$</span>(<span
                class="cm-variable">selector</span>).<span class="cm-property">fadeIn</span>(<span class="cm-variable">speed</span>,<span
                class="cm-variable">callback</span>);<span class="cm-tab" role="presentation"
                                                           cm-text="	"> </span><span class="cm-tab"
                                                                                        role="presentation"
                                                                                        cm-text="	">    </span><span
                class="cm-comment">// 淡入</span></span></pre></div><div style="position: relative;"><div
                class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">2</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span
                class="cm-variable">$</span>(<span class="cm-variable">selector</span>).<span class="cm-property">fadeOut</span>(<span
                class="cm-variable">speed</span>,<span class="cm-variable">callback</span>);<span class="cm-tab"
                                                                                                  role="presentation"
                                                                                                  cm-text="	">    </span><span
                class="cm-tab" role="presentation" cm-text="	">    </span><span
                class="cm-comment">// 淡出</span></span></pre></div><div style="position: relative;"><div
                class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">3</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" class="cm-tab-wrap-hack"
                                                                    style="padding-right: 0.1px;"><span
                class="cm-variable">$</span>(<span class="cm-variable">selector</span>).<span
                class="cm-property">fadeTo</span>(<span class="cm-variable">speed</span>,<span class="cm-variable">opacity</span>,<span
                class="cm-variable">callback</span>);<span class="cm-tab" role="presentation"
                                                           cm-text="	"> </span><span class="cm-comment">// 渐变为给定的不透明度（值介于 0 与 1 之间）<span
                class="cm-tab" role="presentation" cm-text="	"> </span><span class="cm-tab" role="presentation"
                                                                                cm-text="	">    </span></span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 20px;">4</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;"><span class="cm-variable">$</span>(<span
                class="cm-variable">selector</span>).<span class="cm-property">fadeToggle</span>(<span
                class="cm-variable">speed</span>,<span class="cm-variable">callback</span>);<span class="cm-tab"
                                                                                                  role="presentation"
                                                                                                  cm-text="	"> </span><span
                class="cm-comment">// 淡入淡出切换</span></span></pre></div></div></div></div></div></div><div
                style="position: absolute; height: 0px; width: 1px; border-bottom-width: 0px; border-bottom-style: solid; border-bottom-color: transparent; top: 100px;"></div><div
                class="CodeMirror-gutters" style="height: 100px;"><div class="CodeMirror-gutter CodeMirror-linenumbers"
                                                                       style="width: 28px;"></div></div></div></div></pre>
        <h4 id='12使用location对象使用-）方法可以实现用新的url-取代当前窗囗的url'><span>12、使用location对象使用（ ）方法可以实现用新的URL 取代当前窗囗的URL。</span>
        </h4>
        <pre class="md-fences md-end-block md-fences-with-lineno ty-contain-cm modeLoaded" spellcheck="false" lang="js"><div
                class="CodeMirror cm-s-inner cm-s-null-scroll CodeMirror-wrap" lang="js"><div
                style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 10.5px; left: 37px;"><textarea
                autocorrect="off" autocapitalize="off" spellcheck="false" tabindex="0"
                style="position: absolute; bottom: -1em; padding: 0px; width: 1000px; height: 1em; outline: none;"></textarea></div><div
                class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div class="CodeMirror-gutter-filler"
                                                                                     cm-not-content="true"></div><div
                class="CodeMirror-scroll" tabindex="-1"><div class="CodeMirror-sizer"
                                                             style="margin-left: 29px; margin-bottom: 0px; border-right-width: 0px; padding-right: 0px; padding-bottom: 0px;"><div
                style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div
                role="presentation" style="position: relative; outline: none;"><div class="CodeMirror-measure"><pre><span>xxxxxxxxxx</span></pre><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt"><div>1</div></div></div><div
                class="CodeMirror-measure"></div><div style="position: relative; z-index: 1;"></div><div
                class="CodeMirror-code" role="presentation"><div class="CodeMirror-activeline"
                                                                 style="position: relative;"><div
                class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div
                class="CodeMirror-gutter-background CodeMirror-activeline-gutter"
                style="left: -29px; width: 29px;"></div><div
                class="CodeMirror-gutter-wrapper CodeMirror-activeline-gutter" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 20px;">1</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;"><span class="cm-variable">location</span>.<span
                class="cm-property">replace</span>(<span class="cm-variable">url</span>)<span
                class="cm-variable">；</span></span></pre></div></div></div></div></div></div><div
                style="position: absolute; height: 0px; width: 1px; border-bottom-width: 0px; border-bottom-style: solid; border-bottom-color: transparent; top: 25px;"></div><div
                class="CodeMirror-gutters" style="height: 25px;"><div class="CodeMirror-gutter CodeMirror-linenumbers"
                                                                      style="width: 28px;"></div></div></div></div></pre>
        <h4 id='13jquery中表单元素获得焦点失去焦点时触发的事件是-）'><span>13、jQuery中，表单元素获得焦点、失去焦点时触发的事件是（ ）。</span></h4>
        <pre class="md-fences md-end-block md-fences-with-lineno ty-contain-cm modeLoaded" spellcheck="false" lang="js"><div
                class="CodeMirror cm-s-inner cm-s-null-scroll CodeMirror-wrap" lang="js"><div
                style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 10.5px; left: 37px;"><textarea
                autocorrect="off" autocapitalize="off" spellcheck="false" tabindex="0"
                style="position: absolute; bottom: -1em; padding: 0px; width: 1000px; height: 1em; outline: none;"></textarea></div><div
                class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div class="CodeMirror-gutter-filler"
                                                                                     cm-not-content="true"></div><div
                class="CodeMirror-scroll" tabindex="-1"><div class="CodeMirror-sizer"
                                                             style="margin-left: 29px; margin-bottom: 0px; border-right-width: 0px; padding-right: 0px; padding-bottom: 0px;"><div
                style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div
                role="presentation" style="position: relative; outline: none;"><div class="CodeMirror-measure"><pre><span>xxxxxxxxxx</span></pre><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt"><div>2</div></div></div><div
                class="CodeMirror-measure"></div><div style="position: relative; z-index: 1;"></div><div
                class="CodeMirror-code" role="presentation"><div class="CodeMirror-activeline"
                                                                 style="position: relative;"><div
                class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div
                class="CodeMirror-gutter-background CodeMirror-activeline-gutter"
                style="left: -29px; width: 29px;"></div><div
                class="CodeMirror-gutter-wrapper CodeMirror-activeline-gutter" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 20px;">1</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;"><span class="cm-variable">focus</span>()</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 20px;">2</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;"><span
                class="cm-variable">blur</span>()</span></pre></div></div></div></div></div></div><div
                style="position: absolute; height: 0px; width: 1px; border-bottom-width: 0px; border-bottom-style: solid; border-bottom-color: transparent; top: 50px;"></div><div
                class="CodeMirror-gutters" style="height: 50px;"><div class="CodeMirror-gutter CodeMirror-linenumbers"
                                                                      style="width: 28px;"></div></div></div></div></pre>
        <h4 id='14在jquery中既可以模拟鼠标连续单击事件又可以切换元素可见状态的方法是-）'><span>14、在jQuery中既可以模拟鼠标连续单击事件，又可以切换元素可见状态的方法是（ ）。</span></h4>
        <pre class="md-fences md-end-block md-fences-with-lineno ty-contain-cm modeLoaded" spellcheck="false" lang=""><div
                class="CodeMirror cm-s-inner cm-s-null-scroll CodeMirror-wrap" lang=""><div
                style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 10.5px; left: 37px;"><textarea
                autocorrect="off" autocapitalize="off" spellcheck="false" tabindex="0"
                style="position: absolute; bottom: -1em; padding: 0px; width: 1000px; height: 1em; outline: none;"></textarea></div><div
                class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div class="CodeMirror-gutter-filler"
                                                                                     cm-not-content="true"></div><div
                class="CodeMirror-scroll" tabindex="-1"><div class="CodeMirror-sizer"
                                                             style="margin-left: 29px; margin-bottom: 0px; border-right-width: 0px; padding-right: 0px; padding-bottom: 0px;"><div
                style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div
                role="presentation" style="position: relative; outline: none;"><div class="CodeMirror-measure"><pre><span>xxxxxxxxxx</span></pre><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt"><div>1</div></div></div><div
                class="CodeMirror-measure"></div><div style="position: relative; z-index: 1;"></div><div
                class="CodeMirror-code" role="presentation"><div class="CodeMirror-activeline"
                                                                 style="position: relative;"><div
                class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div
                class="CodeMirror-gutter-background CodeMirror-activeline-gutter"
                style="left: -29px; width: 29px;"></div><div
                class="CodeMirror-gutter-wrapper CodeMirror-activeline-gutter" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 20px;">1</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation"
                style="padding-right: 0.1px;">toggle()</span></pre></div></div></div></div></div></div><div
                style="position: absolute; height: 0px; width: 1px; border-bottom-width: 0px; border-bottom-style: solid; border-bottom-color: transparent; top: 25px;"></div><div
                class="CodeMirror-gutters" style="height: 25px;"><div class="CodeMirror-gutter CodeMirror-linenumbers"
                                                                      style="width: 28px;"></div></div></div></div></pre>
        <h4 id='15在jquery中元素的事件绑定解绑的方法名'><span>15、在jQuery中元素的事件绑定、解绑的方法名。</span></h4>
        <pre class="md-fences md-end-block md-fences-with-lineno ty-contain-cm modeLoaded" spellcheck="false"
             lang="tex"><div class="CodeMirror cm-s-inner cm-s-null-scroll CodeMirror-wrap" lang="tex"><div
                style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 10.5px; left: 37px;"><textarea
                autocorrect="off" autocapitalize="off" spellcheck="false" tabindex="0"
                style="position: absolute; bottom: -1em; padding: 0px; width: 1000px; height: 1em; outline: none;"></textarea></div><div
                class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div class="CodeMirror-gutter-filler"
                                                                                     cm-not-content="true"></div><div
                class="CodeMirror-scroll" tabindex="-1"><div class="CodeMirror-sizer"
                                                             style="margin-left: 29px; margin-bottom: 0px; border-right-width: 0px; padding-right: 0px; padding-bottom: 0px;"><div
                style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div
                role="presentation" style="position: relative; outline: none;"><div class="CodeMirror-measure"><pre><span>xxxxxxxxxx</span></pre><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt"><div>5</div></div></div><div
                class="CodeMirror-measure"></div><div style="position: relative; z-index: 1;"></div><div
                class="CodeMirror-code" role="presentation" style=""><div class="CodeMirror-activeline"
                                                                          style="position: relative;"><div
                class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div
                class="CodeMirror-gutter-background CodeMirror-activeline-gutter"
                style="left: -29px; width: 29px;"></div><div
                class="CodeMirror-gutter-wrapper CodeMirror-activeline-gutter" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 20px;">1</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;">bind()方式绑定</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">2</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;">on()方式绑定</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">3</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;">one() 绑定：一次性事件</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">4</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;">unbind()：移除被选择事件的处理程序</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 20px;">5</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation"
                style="padding-right: 0.1px;">off()：通常用于移除通过 on() 方法添加的事件处理程序。</span></pre></div></div></div></div></div></div><div
                style="position: absolute; height: 0px; width: 1px; border-bottom-width: 0px; border-bottom-style: solid; border-bottom-color: transparent; top: 125px;"></div><div
                class="CodeMirror-gutters" style="height: 125px;"><div class="CodeMirror-gutter CodeMirror-linenumbers"
                                                                       style="width: 28px;"></div></div></div></div></pre>
        <h4 id='16xmlhttprequest对象的readstate属性值14的意义'><span>16、XMLHttpRequest对象的readState属性值1、4的意义。</span></h4>
        <pre class="md-fences md-end-block md-fences-with-lineno ty-contain-cm modeLoaded" spellcheck="false"
             lang="tex"><div class="CodeMirror cm-s-inner cm-s-null-scroll CodeMirror-wrap" lang="tex"><div
                style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 10.25px; left: 37px;"><textarea
                autocorrect="off" autocapitalize="off" spellcheck="false" tabindex="0"
                style="position: absolute; bottom: -1em; padding: 0px; width: 1000px; height: 1em; outline: none;"></textarea></div><div
                class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div class="CodeMirror-gutter-filler"
                                                                                     cm-not-content="true"></div><div
                class="CodeMirror-scroll" tabindex="-1"><div class="CodeMirror-sizer"
                                                             style="margin-left: 29px; margin-bottom: 0px; border-right-width: 0px; padding-right: 0px; padding-bottom: 0px;"><div
                style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div
                role="presentation" style="position: relative; outline: none;"><div class="CodeMirror-measure"><pre><span>xxxxxxxxxx</span></pre><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt"><div>2</div></div></div><div
                class="CodeMirror-measure"></div><div style="position: relative; z-index: 1;"></div><div
                class="CodeMirror-code" role="presentation"><div class="CodeMirror-activeline"
                                                                 style="position: relative;"><div
                class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div
                class="CodeMirror-gutter-background CodeMirror-activeline-gutter"
                style="left: -29px; width: 29px;"></div><div
                class="CodeMirror-gutter-wrapper CodeMirror-activeline-gutter" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 20px;">1</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;"><span class="cm-atom">1</span>: open() 方法已经被触发。在这个状态中，可以通过  setRequestHeader() 方法来设置请求的头部， 可以调用 send() 方法来发起请求。</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 20px;">2</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;"><span class="cm-atom">4</span>: 请求操作已经完成。这意味着数据传输已经彻底完成或失败。</span></pre></div></div></div></div></div></div><div
                style="position: absolute; height: 0px; width: 1px; border-bottom-width: 0px; border-bottom-style: solid; border-bottom-color: transparent; top: 75px;"></div><div
                class="CodeMirror-gutters" style="height: 75px;"><div class="CodeMirror-gutter CodeMirror-linenumbers"
                                                                      style="width: 28px;"></div></div></div></div></pre>
        <h4 id='17在ajax模式中客户端的请求是同步还是异步完成的'><span>17、在AJAX模式中，客户端的请求是同步还是异步完成的。</span></h4>
        <pre class="md-fences md-end-block md-fences-with-lineno ty-contain-cm modeLoaded" spellcheck="false"
             lang="tex"><div class="CodeMirror cm-s-inner cm-s-null-scroll CodeMirror-wrap" lang="tex"><div
                style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 10.5px; left: 37px;"><textarea
                autocorrect="off" autocapitalize="off" spellcheck="false" tabindex="0"
                style="position: absolute; bottom: -1em; padding: 0px; width: 1000px; height: 1em; outline: none;"></textarea></div><div
                class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div class="CodeMirror-gutter-filler"
                                                                                     cm-not-content="true"></div><div
                class="CodeMirror-scroll" tabindex="-1"><div class="CodeMirror-sizer"
                                                             style="margin-left: 29px; margin-bottom: 0px; border-right-width: 0px; padding-right: 0px; padding-bottom: 0px;"><div
                style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div
                role="presentation" style="position: relative; outline: none;"><div class="CodeMirror-measure"><pre><span>xxxxxxxxxx</span></pre><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt"><div>1</div></div></div><div
                class="CodeMirror-measure"></div><div style="position: relative; z-index: 1;"></div><div
                class="CodeMirror-code" role="presentation"><div class="CodeMirror-activeline"
                                                                 style="position: relative;"><div
                class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div
                class="CodeMirror-gutter-background CodeMirror-activeline-gutter"
                style="left: -29px; width: 29px;"></div><div
                class="CodeMirror-gutter-wrapper CodeMirror-activeline-gutter" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 20px;">1</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;">异步</span></pre></div></div></div></div></div></div><div
                style="position: absolute; height: 0px; width: 1px; border-bottom-width: 0px; border-bottom-style: solid; border-bottom-color: transparent; top: 25px;"></div><div
                class="CodeMirror-gutters" style="height: 25px;"><div class="CodeMirror-gutter CodeMirror-linenumbers"
                                                                      style="width: 28px;"></div></div></div></div></pre>
        <h4 id='18bootsrap轮播图插件通过什么属性修改轮播图的页面切换的时间间隔'><span>18、Bootsrap轮播图插件通过什么属性修改轮播图的页面切换的时间间隔。</span></h4>
        <pre class="md-fences md-end-block md-fences-with-lineno ty-contain-cm modeLoaded" spellcheck="false"
             lang="tex"><div class="CodeMirror cm-s-inner cm-s-null-scroll CodeMirror-wrap" lang="tex"><div
                style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 10.5px; left: 37px;"><textarea
                autocorrect="off" autocapitalize="off" spellcheck="false" tabindex="0"
                style="position: absolute; bottom: -1em; padding: 0px; width: 1000px; height: 1em; outline: none;"></textarea></div><div
                class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div class="CodeMirror-gutter-filler"
                                                                                     cm-not-content="true"></div><div
                class="CodeMirror-scroll" tabindex="-1"><div class="CodeMirror-sizer"
                                                             style="margin-left: 29px; margin-bottom: 0px; border-right-width: 0px; padding-right: 0px; padding-bottom: 0px;"><div
                style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div
                role="presentation" style="position: relative; outline: none;"><div class="CodeMirror-measure"><pre><span>xxxxxxxxxx</span></pre><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt"><div>1</div></div></div><div
                class="CodeMirror-measure"></div><div style="position: relative; z-index: 1;"></div><div
                class="CodeMirror-code" role="presentation"><div class="CodeMirror-activeline"
                                                                 style="position: relative;"><div
                class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div
                class="CodeMirror-gutter-background CodeMirror-activeline-gutter"
                style="left: -29px; width: 29px;"></div><div
                class="CodeMirror-gutter-wrapper CodeMirror-activeline-gutter" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 20px;">1</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation"
                style="padding-right: 0.1px;"> interval</span></pre></div></div></div></div></div></div><div
                style="position: absolute; height: 0px; width: 1px; border-bottom-width: 0px; border-bottom-style: solid; border-bottom-color: transparent; top: 25px;"></div><div
                class="CodeMirror-gutters" style="height: 25px;"><div class="CodeMirror-gutter CodeMirror-linenumbers"
                                                                      style="width: 28px;"></div></div></div></div></pre>
        <h4 id='19bootstrap的布局中列偏移浮动'><span>19、Bootstrap的布局中，列偏移、浮动。</span></h4>
        <pre class="md-fences md-end-block md-fences-with-lineno ty-contain-cm modeLoaded" spellcheck="false"
             lang="html"><div class="CodeMirror cm-s-inner cm-s-null-scroll CodeMirror-wrap" lang="html"><div
                style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 10.5px; left: 46px;"><textarea
                autocorrect="off" autocapitalize="off" spellcheck="false" tabindex="0"
                style="position: absolute; bottom: -1em; padding: 0px; width: 1000px; height: 1em; outline: none;"></textarea></div><div
                class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div class="CodeMirror-gutter-filler"
                                                                                     cm-not-content="true"></div><div
                class="CodeMirror-scroll" tabindex="-1"><div class="CodeMirror-sizer"
                                                             style="margin-left: 38px; margin-bottom: 0px; border-right-width: 0px; padding-right: 0px; padding-bottom: 0px;"><div
                style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div
                role="presentation" style="position: relative; outline: none;"><div class="CodeMirror-measure"><pre><span>xxxxxxxxxx</span></pre><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt"><div>10</div></div></div><div
                class="CodeMirror-measure"></div><div style="position: relative; z-index: 1;"></div><div
                class="CodeMirror-code" role="presentation" style=""><div class="CodeMirror-activeline"
                                                                          style="position: relative;"><div
                class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div
                class="CodeMirror-gutter-background CodeMirror-activeline-gutter"
                style="left: -38px; width: 38px;"></div><div
                class="CodeMirror-gutter-wrapper CodeMirror-activeline-gutter" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 29px;">1</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;">// 1、列偏移 .col-xs-offset-*、 .col-sm-offset-*、 .col-md-offset-*、 .col-lg-offset-*</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">2</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;">// 向右移动</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">3</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span
                class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">div</span> <span
                class="cm-attribute">class</span>=<span class="cm-string">"row"</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">4</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">div</span> <span
                class="cm-attribute">class</span>=<span
                class="cm-string">"col-md-6 col-md-offset-3 bg-primary"</span><span
                class="cm-tag cm-bracket">&gt;</span>.col-md-6<span class="cm-tag cm-bracket">&lt;/</span><span
                class="cm-tag">div</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">5</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span
                class="cm-tag cm-bracket">&lt;/</span><span class="cm-tag">div</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">6</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;">// 2、浮动 col-X-push-*是向右浮动，col-X-pull-*是向左浮动.</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">7</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span
                class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">div</span> <span
                class="cm-attribute">class</span>=<span class="cm-string">"row"</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">8</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">div</span> <span
                class="cm-attribute">class</span>=<span class="cm-string">"col-md-9 col-md-push-3"</span><span
                class="cm-tag cm-bracket">&gt;</span>.col-md-push-3<span class="cm-tag cm-bracket">&lt;/</span><span
                class="cm-tag">div</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">9</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">div</span> <span
                class="cm-attribute">class</span>=<span class="cm-string">"col-md-3 col-md-pull-9"</span><span
                class="cm-tag cm-bracket">&gt;</span>.col-md-pull-9<span class="cm-tag cm-bracket">&lt;/</span><span
                class="cm-tag">div</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 29px;">10</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;"><span class="cm-tag cm-bracket">&lt;/</span><span
                class="cm-tag">div</span><span
                class="cm-tag cm-bracket">&gt;</span></span></pre></div></div></div></div></div></div><div
                style="position: absolute; height: 0px; width: 1px; border-bottom-width: 0px; border-bottom-style: solid; border-bottom-color: transparent; top: 250px;"></div><div
                class="CodeMirror-gutters" style="height: 250px;"><div class="CodeMirror-gutter CodeMirror-linenumbers"
                                                                       style="width: 37px;"></div></div></div></div></pre>
        <h4 id='20bootstrap中定义的胶囊式导航的类是什么'><span>20、Bootstrap中，定义的胶囊式导航的类是什么。</span></h4>
        <pre class="md-fences md-end-block md-fences-with-lineno ty-contain-cm modeLoaded" spellcheck="false"
             lang="html"><div class="CodeMirror cm-s-inner cm-s-null-scroll CodeMirror-wrap" lang="html"><div
                style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 10.5px; left: 37px;"><textarea
                autocorrect="off" autocapitalize="off" spellcheck="false" tabindex="0"
                style="position: absolute; bottom: -1em; padding: 0px; width: 1000px; height: 1em; outline: none;"></textarea></div><div
                class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div class="CodeMirror-gutter-filler"
                                                                                     cm-not-content="true"></div><div
                class="CodeMirror-scroll" tabindex="-1"><div class="CodeMirror-sizer"
                                                             style="margin-left: 29px; margin-bottom: 0px; border-right-width: 0px; padding-right: 0px; padding-bottom: 0px;"><div
                style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div
                role="presentation" style="position: relative; outline: none;"><div class="CodeMirror-measure"><pre><span>xxxxxxxxxx</span></pre><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt"><div>5</div></div></div><div
                class="CodeMirror-measure"></div><div style="position: relative; z-index: 1;"></div><div
                class="CodeMirror-code" role="presentation" style=""><div class="CodeMirror-activeline"
                                                                          style="position: relative;"><div
                class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div
                class="CodeMirror-gutter-background CodeMirror-activeline-gutter"
                style="left: -29px; width: 29px;"></div><div
                class="CodeMirror-gutter-wrapper CodeMirror-activeline-gutter" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 20px;">1</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;"><span class="cm-tag cm-bracket">&lt;</span><span
                class="cm-tag">ul</span> <span class="cm-attribute">class</span>=<span
                class="cm-string">"nav nav-pills"</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">2</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp;<span
                class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">li</span> <span
                class="cm-attribute">role</span>=<span class="cm-string">"presentation"</span> <span
                class="cm-attribute">class</span>=<span class="cm-string">"active"</span><span
                class="cm-tag cm-bracket">&gt;&lt;</span><span class="cm-tag">a</span> <span
                class="cm-attribute">href</span>=<span class="cm-string">"#"</span><span
                class="cm-tag cm-bracket">&gt;</span>Home<span class="cm-tag cm-bracket">&lt;/</span><span
                class="cm-tag">a</span><span class="cm-tag cm-bracket">&gt;&lt;/</span><span
                class="cm-tag">li</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">3</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp;<span
                class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">li</span> <span
                class="cm-attribute">role</span>=<span class="cm-string">"presentation"</span><span
                class="cm-tag cm-bracket">&gt;&lt;</span><span class="cm-tag">a</span> <span
                class="cm-attribute">href</span>=<span class="cm-string">"#"</span><span
                class="cm-tag cm-bracket">&gt;</span>Profile<span class="cm-tag cm-bracket">&lt;/</span><span
                class="cm-tag">a</span><span class="cm-tag cm-bracket">&gt;&lt;/</span><span
                class="cm-tag">li</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">4</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp;<span
                class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">li</span> <span
                class="cm-attribute">role</span>=<span class="cm-string">"presentation"</span><span
                class="cm-tag cm-bracket">&gt;&lt;</span><span class="cm-tag">a</span> <span
                class="cm-attribute">href</span>=<span class="cm-string">"#"</span><span
                class="cm-tag cm-bracket">&gt;</span>Messages<span class="cm-tag cm-bracket">&lt;/</span><span
                class="cm-tag">a</span><span class="cm-tag cm-bracket">&gt;&lt;/</span><span
                class="cm-tag">li</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 20px;">5</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;"><span class="cm-tag cm-bracket">&lt;/</span><span
                class="cm-tag">ul</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div></div></div></div></div></div><div
                style="position: absolute; height: 0px; width: 1px; border-bottom-width: 0px; border-bottom-style: solid; border-bottom-color: transparent; top: 125px;"></div><div
                class="CodeMirror-gutters" style="height: 125px;"><div class="CodeMirror-gutter CodeMirror-linenumbers"
                                                                       style="width: 28px;"></div></div></div></div></pre>
        <h3 id='二简答题'><span>二、简答题</span></h3><h4 id='1举例说明ajax全局事件可以通过何种方式进行事件绑定与解除'><span>1、举例说明AJAX全局事件可以通过何种方式进行事件绑定与解除？**</span>
        </h4>
        <p><span> </span></p><h4 id='2什么是jquery后代遍历常用的children方法和find方法的区别'><span>2、什么是jQuery后代遍历，常用的children()方法和find()方法的区别。**</span>
        </h4>
        <pre class="md-fences md-end-block md-fences-with-lineno ty-contain-cm modeLoaded" spellcheck="false" lang="tex"
             style="break-inside: unset;"><div class="CodeMirror cm-s-inner cm-s-null-scroll CodeMirror-wrap"
                                               lang="tex"><div
                style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 10.5px; left: 46px;"><textarea
                autocorrect="off" autocapitalize="off" spellcheck="false" tabindex="0"
                style="position: absolute; bottom: -1em; padding: 0px; width: 1000px; height: 1em; outline: none;"></textarea></div><div
                class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div class="CodeMirror-gutter-filler"
                                                                                     cm-not-content="true"></div><div
                class="CodeMirror-scroll" tabindex="-1"><div class="CodeMirror-sizer"
                                                             style="margin-left: 38px; margin-bottom: 0px; border-right-width: 0px; padding-right: 0px; padding-bottom: 0px;"><div
                style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div
                role="presentation" style="position: relative; outline: none;"><div class="CodeMirror-measure"><pre><span>xxxxxxxxxx</span></pre><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt"><div>17</div></div></div><div
                class="CodeMirror-measure"></div><div style="position: relative; z-index: 1;"></div><div
                class="CodeMirror-code" role="presentation" style=""><div class="CodeMirror-activeline"
                                                                          style="position: relative;"><div
                class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div
                class="CodeMirror-gutter-background CodeMirror-activeline-gutter"
                style="left: -38px; width: 38px;"></div><div
                class="CodeMirror-gutter-wrapper CodeMirror-activeline-gutter" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 29px;">1</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;"><span
                class="cm-atom">1.</span> 遍历方式不同</span></pre></div><div style="position: relative;"><div
                class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">2</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;">children()方法是一个筛选器，顾名思义就是筛选子元素，筛选那些符合条件的子元素。</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">3</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;">find()方法获得当前元素集合中每个元素的后代，通过选择器、jQuery 对象或元素来筛选。</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">4</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span cm-text=""
                                                                                                        cm-zwsp="">
</span></span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">5</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span class="cm-atom">2.</span> 参数不同</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">6</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;">children()方法的参数selector 是可选的（optionally），用来过滤子元素。</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">7</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;">jQueryObject.children( <span
                class="cm-bracket">[</span> selector <span class="cm-bracket">]</span> )</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">8</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;">find()方法的参数selector方法是必选的。 </span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">9</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;">jQueryObject.find( <span
                class="cm-bracket">[</span> selector <span class="cm-bracket">]</span> )</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 29px;">10</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;"><span cm-text="" cm-zwsp="">
</span></span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">11</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span class="cm-atom">3.</span> 获得内容不同</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">12</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;">children方法获得的仅仅是元素一下级的子元素，即：immediate children。 </span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">13</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;">find方法获得所有下级元素，即：descendants of these elements in the</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">14</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span cm-text=""
                                                                                                        cm-zwsp="">
</span></span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">15</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span class="cm-atom">4.</span> 返回类型不同</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">16</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;">children()方法返回被选元素的所有直接子元素</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 29px;">17</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation"
                style="padding-right: 0.1px;">find()方法返回获得当前元素集合中每个元素的后代</span></pre></div></div></div></div></div></div><div
                style="position: absolute; height: 0px; width: 1px; border-bottom-width: 0px; border-bottom-style: solid; border-bottom-color: transparent; top: 425px;"></div><div
                class="CodeMirror-gutters" style="height: 425px;"><div class="CodeMirror-gutter CodeMirror-linenumbers"
                                                                       style="width: 37px;"></div></div></div></div></pre>
        <h4 id='3简述jquery-ajax-load方法的作用写出将文件texttxt的内容加载到iddemo-的段落元素-p-中的代码'><span>3、简述jQuery AJAX load()方法的作用，写出将文件&quot;text.txt&quot;的内容加载到id=&quot;demo&quot; 的段落元素&lt; p &gt;中的代码。</span>
        </h4>
        <pre class="md-fences md-end-block md-fences-with-lineno ty-contain-cm modeLoaded" spellcheck="false"
             lang="html"><div class="CodeMirror cm-s-inner cm-s-null-scroll CodeMirror-wrap" lang="html"><div
                style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 10.25px; left: 37px;"><textarea
                autocorrect="off" autocapitalize="off" spellcheck="false" tabindex="0"
                style="position: absolute; bottom: -1em; padding: 0px; width: 1000px; height: 1em; outline: none;"></textarea></div><div
                class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div class="CodeMirror-gutter-filler"
                                                                                     cm-not-content="true"></div><div
                class="CodeMirror-scroll" tabindex="-1"><div class="CodeMirror-sizer"
                                                             style="margin-left: 29px; margin-bottom: 0px; border-right-width: 0px; padding-right: 0px; padding-bottom: 0px;"><div
                style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div
                role="presentation" style="position: relative; outline: none;"><div class="CodeMirror-measure"><pre><span>xxxxxxxxxx</span></pre><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt"><div>7</div></div></div><div
                class="CodeMirror-measure"></div><div style="position: relative; z-index: 1;"></div><div
                class="CodeMirror-code" role="presentation" style=""><div class="CodeMirror-activeline"
                                                                          style="position: relative;"><div
                class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div
                class="CodeMirror-gutter-background CodeMirror-activeline-gutter"
                style="left: -29px; width: 29px;"></div><div
                class="CodeMirror-gutter-wrapper CodeMirror-activeline-gutter" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 20px;">1</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;">// load(url, *[data]*, *[callback]*)，载入文件内容并插入至 DOM 中。默认使用 GET 方式 - 传递附加参数时自动转换为 POST 方式。</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">2</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span
                class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">body</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">3</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">p</span> <span class="cm-attribute">id</span>=<span
                class="cm-string">"demo"</span><span class="cm-tag cm-bracket">&gt;&lt;/</span><span
                class="cm-tag">p</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">4</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">script</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">5</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp;<span
                class="cm-variable">$</span>(<span class="cm-string">'#demo'</span>).<span
                class="cm-property">load</span>(<span class="cm-string">'./text.txt'</span>);</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">6</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-tag cm-bracket">&lt;/</span><span class="cm-tag">script</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 20px;">7</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;"><span class="cm-tag cm-bracket">&lt;/</span><span
                class="cm-tag">body</span><span
                class="cm-tag cm-bracket">&gt;</span></span></pre></div></div></div></div></div></div><div
                style="position: absolute; height: 0px; width: 1px; border-bottom-width: 0px; border-bottom-style: solid; border-bottom-color: transparent; top: 200px;"></div><div
                class="CodeMirror-gutters" style="height: 200px;"><div class="CodeMirror-gutter CodeMirror-linenumbers"
                                                                       style="width: 28px;"></div></div></div></div></pre>
        <h4 id='4bootstrap中的对话框由哪几个部分组成'><span>4、Bootstrap中的对话框由哪几个部分组成？</span></h4>
        <pre class="md-fences md-end-block md-fences-with-lineno ty-contain-cm modeLoaded" spellcheck="false"
             lang="tex"><div class="CodeMirror cm-s-inner cm-s-null-scroll CodeMirror-wrap" lang="tex"><div
                style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 10.5px; left: 37px;"><textarea
                autocorrect="off" autocapitalize="off" spellcheck="false" tabindex="0"
                style="position: absolute; bottom: -1em; padding: 0px; width: 1000px; height: 1em; outline: none;"></textarea></div><div
                class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div class="CodeMirror-gutter-filler"
                                                                                     cm-not-content="true"></div><div
                class="CodeMirror-scroll" tabindex="-1"><div class="CodeMirror-sizer"
                                                             style="margin-left: 29px; margin-bottom: 0px; border-right-width: 0px; padding-right: 0px; padding-bottom: 0px;"><div
                style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div
                role="presentation" style="position: relative; outline: none;"><div class="CodeMirror-measure"><pre><span>xxxxxxxxxx</span></pre><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt"><div>8</div></div></div><div
                class="CodeMirror-measure"></div><div style="position: relative; z-index: 1;"></div><div
                class="CodeMirror-code" role="presentation" style=""><div class="CodeMirror-activeline"
                                                                          style="position: relative;"><div
                class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div
                class="CodeMirror-gutter-background CodeMirror-activeline-gutter"
                style="left: -29px; width: 29px;"></div><div
                class="CodeMirror-gutter-wrapper CodeMirror-activeline-gutter" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 20px;">1</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation"
                style="padding-right: 0.1px;">class="modal"：对话框的最外层容器，可以控制对话框的显示与隐藏。</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">2</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;">class= "modal- dialog " ：第二层容器。</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">3</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;">class= "modal- content"：第三层容器，控制对话框的边框、边距、背景、阴影效果等；</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">4</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span cm-text=""
                                                                                                        cm-zwsp="">
</span></span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">5</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;">而这个容器里面又包含了另外三个部分：</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">6</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;">class= "modal-header"：对话框头部，包含标题、关闭按钮等。</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">7</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;">class= "modal- body"：对话框主体，是对话框的主要内容。</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 20px;">8</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation"
                style="padding-right: 0.1px;">class= "modal-footer"：对话框脚注，包含操作按钮等。</span></pre></div></div></div></div></div></div><div
                style="position: absolute; height: 0px; width: 1px; border-bottom-width: 0px; border-bottom-style: solid; border-bottom-color: transparent; top: 200px;"></div><div
                class="CodeMirror-gutters" style="height: 200px;"><div class="CodeMirror-gutter CodeMirror-linenumbers"
                                                                       style="width: 28px;"></div></div></div></div></pre>
        <h4 id='5下列代码中要选择第1项-的li写出5-种不同的jquery选择器和过滤器'><span>5、下列代码中，要选择&quot;第1项&quot; 的</span><span>&lt;</span><span>li</span><span>&gt;</span><span>，写出5 种不同的jQuery选择器和过滤器。</span>
        </h4>
        <pre class="md-fences md-end-block md-fences-with-lineno ty-contain-cm modeLoaded" spellcheck="false"
             lang="html"><div class="CodeMirror cm-s-inner cm-s-null-scroll CodeMirror-wrap" lang="html"><div
                style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 10.5px; left: 37px;"><textarea
                autocorrect="off" autocapitalize="off" spellcheck="false" tabindex="0"
                style="position: absolute; bottom: -1em; padding: 0px; width: 1000px; height: 1em; outline: none;"></textarea></div><div
                class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div class="CodeMirror-gutter-filler"
                                                                                     cm-not-content="true"></div><div
                class="CodeMirror-scroll" tabindex="-1"><div class="CodeMirror-sizer"
                                                             style="margin-left: 29px; margin-bottom: 0px; border-right-width: 0px; padding-right: 0px; padding-bottom: 0px;"><div
                style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div
                role="presentation" style="position: relative; outline: none;"><div class="CodeMirror-measure"><pre><span>xxxxxxxxxx</span></pre><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt"><div>7</div></div></div><div
                class="CodeMirror-measure"></div><div style="position: relative; z-index: 1;"></div><div
                class="CodeMirror-code" role="presentation" style=""><div class="CodeMirror-activeline"
                                                                          style="position: relative;"><div
                class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div
                class="CodeMirror-gutter-background CodeMirror-activeline-gutter"
                style="left: -29px; width: 29px;"></div><div
                class="CodeMirror-gutter-wrapper CodeMirror-activeline-gutter" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 20px;">1</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;"><span class="cm-tag cm-bracket">&lt;</span><span
                class="cm-tag">div</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">2</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">ul</span> <span class="cm-attribute">id</span>=<span
                class="cm-string">"ul-1"</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">3</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp;<span
                class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">li</span> <span class="cm-attribute">id</span>=<span
                class="cm-string">"li-1"</span> <span class="cm-attribute">class</span>=<span
                class="cm-string">"Cli-1"</span><span class="cm-tag cm-bracket">&gt;</span>第1项<span
                class="cm-tag cm-bracket">&lt;/</span><span class="cm-tag">li</span><span
                class="cm-tag cm-bracket">&gt;</span></span></pre></div><div style="position: relative;"><div
                class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">4</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp;<span
                class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">li</span><span
                class="cm-tag cm-bracket">&gt;</span>第2项<span class="cm-tag cm-bracket">&lt;/</span><span
                class="cm-tag">li</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">5</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp;<span
                class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">li</span><span
                class="cm-tag cm-bracket">&gt;</span>第3项<span class="cm-tag cm-bracket">&lt;/</span><span
                class="cm-tag">li</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">6</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-tag cm-bracket">&lt;/</span><span class="cm-tag">ul</span><span
                class="cm-tag cm-bracket">&gt;</span></span></pre></div><div style="position: relative;"><div
                class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 20px;">7</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;"><span class="cm-tag cm-bracket">&lt;/</span><span
                class="cm-tag">div</span><span
                class="cm-tag cm-bracket">&gt;</span></span></pre></div></div></div></div></div></div><div
                style="position: absolute; height: 0px; width: 1px; border-bottom-width: 0px; border-bottom-style: solid; border-bottom-color: transparent; top: 175px;"></div><div
                class="CodeMirror-gutters" style="height: 175px;"><div class="CodeMirror-gutter CodeMirror-linenumbers"
                                                                       style="width: 28px;"></div></div></div></div></pre>
        <pre class="md-fences md-end-block md-fences-with-lineno ty-contain-cm modeLoaded" spellcheck="false" lang="js"><div
                class="CodeMirror cm-s-inner cm-s-null-scroll CodeMirror-wrap" lang="js"><div
                style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 10.5px; left: 37px;"><textarea
                autocorrect="off" autocapitalize="off" spellcheck="false" tabindex="0"
                style="position: absolute; bottom: -1em; padding: 0px; width: 1000px; height: 1em; outline: none;"></textarea></div><div
                class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div class="CodeMirror-gutter-filler"
                                                                                     cm-not-content="true"></div><div
                class="CodeMirror-scroll" tabindex="-1"><div class="CodeMirror-sizer"
                                                             style="margin-left: 29px; margin-bottom: 0px; border-right-width: 0px; padding-right: 0px; padding-bottom: 0px;"><div
                style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div
                role="presentation" style="position: relative; outline: none;"><div class="CodeMirror-measure"><pre><span>xxxxxxxxxx</span></pre><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt"><div>9</div></div></div><div
                class="CodeMirror-measure"></div><div style="position: relative; z-index: 1;"></div><div
                class="CodeMirror-code" role="presentation" style=""><div class="CodeMirror-activeline"
                                                                          style="position: relative;"><div
                class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div
                class="CodeMirror-gutter-background CodeMirror-activeline-gutter"
                style="left: -29px; width: 29px;"></div><div
                class="CodeMirror-gutter-wrapper CodeMirror-activeline-gutter" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 20px;">1</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;"><span class="cm-variable">$</span>(<span
                class="cm-string">"#li-1"</span>)</span></pre></div><div style="position: relative;"><div
                class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">2</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span
                class="cm-variable">$</span>(<span class="cm-string">"li[id]"</span>)</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">3</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span
                class="cm-variable">$</span>(<span class="cm-string">"[id='li-1']"</span>)</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">4</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span
                class="cm-variable">$</span>(<span class="cm-string">"li:first"</span>)</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">5</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span
                class="cm-variable">$</span>(<span class="cm-string">"li:first-child(1)"</span>)</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">6</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span
                class="cm-variable">$</span>(<span class="cm-string">"li:nth-child(1)"</span>)</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">7</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span
                class="cm-variable">$</span>(<span class="cm-string">"li:eq(0)"</span>)</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 20px;">8</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span
                class="cm-variable">$</span>(<span class="cm-string">"li:lt(1)"</span>)</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -29px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 20px;">9</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;"><span class="cm-variable">$</span>(<span
                class="cm-string">"li:contains('1')"</span>)</span></pre></div></div></div></div></div></div><div
                style="position: absolute; height: 0px; width: 1px; border-bottom-width: 0px; border-bottom-style: solid; border-bottom-color: transparent; top: 225px;"></div><div
                class="CodeMirror-gutters" style="height: 225px;"><div class="CodeMirror-gutter CodeMirror-linenumbers"
                                                                       style="width: 28px;"></div></div></div></div></pre>
        <pre class="md-fences md-end-block md-fences-with-lineno ty-contain-cm modeLoaded" spellcheck="false"
             lang="html"><div class="CodeMirror cm-s-inner cm-s-null-scroll CodeMirror-wrap" lang="html"><div
                style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 10.5px; left: 46px;"><textarea
                autocorrect="off" autocapitalize="off" spellcheck="false" tabindex="0"
                style="position: absolute; bottom: -1em; padding: 0px; width: 1000px; height: 1em; outline: none;"></textarea></div><div
                class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div class="CodeMirror-gutter-filler"
                                                                                     cm-not-content="true"></div><div
                class="CodeMirror-scroll" tabindex="-1"><div class="CodeMirror-sizer"
                                                             style="margin-left: 38px; margin-bottom: 0px; border-right-width: 0px; padding-right: 0px; padding-bottom: 0px;"><div
                style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div
                role="presentation" style="position: relative; outline: none;"><div class="CodeMirror-measure"><pre><span>xxxxxxxxxx</span></pre><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt"><div>12</div></div></div><div
                class="CodeMirror-measure"></div><div style="position: relative; z-index: 1;"></div><div
                class="CodeMirror-code" role="presentation" style=""><div class="CodeMirror-activeline"
                                                                          style="position: relative;"><div
                class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div
                class="CodeMirror-gutter-background CodeMirror-activeline-gutter"
                style="left: -38px; width: 38px;"></div><div
                class="CodeMirror-gutter-wrapper CodeMirror-activeline-gutter" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 29px;">1</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;"><span class="cm-tag cm-bracket">&lt;</span><span
                class="cm-tag">table</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">2</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">tr</span> <span class="cm-attribute">id</span>=<span
                class="cm-string">"row1"</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">3</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp;<span
                class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">td</span><span
                class="cm-tag cm-bracket">&gt;</span>aa<span class="cm-tag cm-bracket">&lt;/</span><span class="cm-tag">td</span><span
                class="cm-tag cm-bracket">&gt;</span></span></pre></div><div style="position: relative;"><div
                class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">4</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp;<span
                class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">td</span> <span class="cm-attribute">id</span>=<span
                class="cm-string">"c12"</span><span class="cm-tag cm-bracket">&gt;</span> bb<span
                class="cm-tag cm-bracket">&lt;/</span><span class="cm-tag">td</span><span
                class="cm-tag cm-bracket">&gt;</span></span></pre></div><div style="position: relative;"><div
                class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">5</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp;<span
                class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">td</span><span
                class="cm-tag cm-bracket">&gt;</span>cc<span class="cm-tag cm-bracket">&lt;/</span><span class="cm-tag">td</span><span
                class="cm-tag cm-bracket">&gt;</span></span></pre></div><div style="position: relative;"><div
                class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">6</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-tag cm-bracket">&lt;/</span><span class="cm-tag">tr</span><span
                class="cm-tag cm-bracket">&gt;</span></span></pre></div><div style="position: relative;"><div
                class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">7</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">tr</span><span
                class="cm-tag cm-bracket">&gt;</span></span></pre></div><div style="position: relative;"><div
                class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">8</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp;<span
                class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">td</span><span
                class="cm-tag cm-bracket">&gt;</span>dd<span class="cm-tag cm-bracket">&lt;/</span><span class="cm-tag">td</span><span
                class="cm-tag cm-bracket">&gt;</span></span></pre></div><div style="position: relative;"><div
                class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">9</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp;<span
                class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">td</span><span
                class="cm-tag cm-bracket">&gt;</span>ee<span class="cm-tag cm-bracket">&lt;/</span><span class="cm-tag">td</span><span
                class="cm-tag cm-bracket">&gt;</span></span></pre></div><div style="position: relative;"><div
                class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 29px;">10</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp;<span
                class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">td</span><span
                class="cm-tag cm-bracket">&gt;</span>ff<span class="cm-tag cm-bracket">&lt;/</span><span class="cm-tag">td</span><span
                class="cm-tag cm-bracket">&gt;</span></span></pre></div><div style="position: relative;"><div
                class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">11</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-tag cm-bracket">&lt;/</span><span class="cm-tag">tr</span><span
                class="cm-tag cm-bracket">&gt;</span></span></pre></div><div style="position: relative;"><div
                class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 29px;">12</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;"><span class="cm-tag cm-bracket">&lt;/</span><span
                class="cm-tag">table</span><span
                class="cm-tag cm-bracket">&gt;</span></span></pre></div></div></div></div></div></div><div
                style="position: absolute; height: 0px; width: 1px; border-bottom-width: 0px; border-bottom-style: solid; border-bottom-color: transparent; top: 300px;"></div><div
                class="CodeMirror-gutters" style="height: 300px;"><div class="CodeMirror-gutter CodeMirror-linenumbers"
                                                                       style="width: 37px;"></div></div></div></div></pre>
        <h3 id='三写出程序运行结果'><span>三、写出程序运行结果</span></h3>
        <ol start=''>
            <li>
                <pre class="md-fences md-end-block md-fences-with-lineno ty-contain-cm modeLoaded" spellcheck="false"
                     lang="html" style="break-inside: unset;"><div
                        class="CodeMirror cm-s-inner cm-s-null-scroll CodeMirror-wrap" lang="html"><div
                        style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 10.5px; left: 46px;"><textarea
                        autocorrect="off" autocapitalize="off" spellcheck="false" tabindex="0"
                        style="position: absolute; bottom: -1em; padding: 0px; width: 1000px; height: 1em; outline: none;"></textarea></div><div
                        class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div
                        class="CodeMirror-gutter-filler" cm-not-content="true"></div><div class="CodeMirror-scroll"
                                                                                          tabindex="-1"><div
                        class="CodeMirror-sizer"
                        style="margin-left: 38px; margin-bottom: 0px; border-right-width: 0px; padding-right: 0px; padding-bottom: 0px;"><div
                        style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div
                        role="presentation" style="position: relative; outline: none;"><div class="CodeMirror-measure"><pre><span>xxxxxxxxxx</span></pre><div
                        class="CodeMirror-linenumber CodeMirror-gutter-elt"><div>20</div></div></div><div
                        class="CodeMirror-measure"></div><div style="position: relative; z-index: 1;"></div><div
                        class="CodeMirror-code" role="presentation" style=""><div class="CodeMirror-activeline"
                                                                                  style="position: relative;"><div
                        class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div
                        class="CodeMirror-gutter-background CodeMirror-activeline-gutter"
                        style="left: -38px; width: 38px;"></div><div
                        class="CodeMirror-gutter-wrapper CodeMirror-activeline-gutter" style="left: -38px;"><div
                        class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                        style="left: 0px; width: 29px;">1</div></div><pre class=" CodeMirror-line " role="presentation"><span
                        role="presentation" style="padding-right: 0.1px;"><span
                        class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">canvas</span> <span
                        class="cm-attribute">id</span>=<span class="cm-string">"mycanvas"</span> <span
                        class="cm-attribute">width</span>=<span class="cm-string">"400"</span> <span
                        class="cm-attribute">height</span>=<span class="cm-string">"400"</span><span
                        class="cm-tag cm-bracket">&gt;</span></span></pre></div><div style="position: relative;"><div
                        class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                        class="CodeMirror-linenumber CodeMirror-gutter-elt"
                        style="left: 0px; width: 29px;">2</div></div><pre class=" CodeMirror-line " role="presentation"><span
                        role="presentation" style="padding-right: 0.1px;"> &nbsp;  你的浏览器不支持Canvas</span></pre></div><div
                        style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                        class="CodeMirror-linenumber CodeMirror-gutter-elt"
                        style="left: 0px; width: 29px;">3</div></div><pre class=" CodeMirror-line " role="presentation"><span
                        role="presentation" style="padding-right: 0.1px;"><span
                        class="cm-tag cm-bracket">&lt;/</span><span class="cm-tag">canvas</span><span
                        class="cm-tag cm-bracket">&gt;</span></span></pre></div><div style="position: relative;"><div
                        class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                        class="CodeMirror-linenumber CodeMirror-gutter-elt"
                        style="left: 0px; width: 29px;">4</div></div><pre class=" CodeMirror-line " role="presentation"><span
                        role="presentation" style="padding-right: 0.1px;"><span
                        class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">script</span><span
                        class="cm-tag cm-bracket">&gt;</span></span></pre></div><div style="position: relative;"><div
                        class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                        class="CodeMirror-linenumber CodeMirror-gutter-elt"
                        style="left: 0px; width: 29px;">5</div></div><pre class=" CodeMirror-line " role="presentation"><span
                        role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                        class="cm-keyword">var</span> <span class="cm-def">ctx</span> <span class="cm-operator">=</span> <span
                        class="cm-variable">document</span>.<span class="cm-property">getElementById</span>(<span
                        class="cm-string">'mycanvas'</span>).<span class="cm-property">getContext</span>(<span
                        class="cm-string">'2d'</span>);</span></pre></div><div style="position: relative;"><div
                        class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                        class="CodeMirror-linenumber CodeMirror-gutter-elt"
                        style="left: 0px; width: 29px;">6</div></div><pre class=" CodeMirror-line " role="presentation"><span
                        role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                        class="cm-keyword">var</span> <span class="cm-def">dx</span> <span class="cm-operator">=</span> <span
                        class="cm-number">100</span>;</span></pre></div><div style="position: relative;"><div
                        class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                        class="CodeMirror-linenumber CodeMirror-gutter-elt"
                        style="left: 0px; width: 29px;">7</div></div><pre class=" CodeMirror-line " role="presentation"><span
                        role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                        class="cm-keyword">var</span> <span class="cm-def">dy</span> <span class="cm-operator">=</span> <span
                        class="cm-number">100</span>;</span></pre></div><div style="position: relative;"><div
                        class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                        class="CodeMirror-linenumber CodeMirror-gutter-elt"
                        style="left: 0px; width: 29px;">8</div></div><pre class=" CodeMirror-line " role="presentation"><span
                        role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                        class="cm-keyword">var</span> <span class="cm-def">r</span> <span
                        class="cm-operator">=</span> <span class="cm-number">100</span>;</span></pre></div><div
                        style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                        class="CodeMirror-linenumber CodeMirror-gutter-elt"
                        style="left: 0px; width: 29px;">9</div></div><pre class=" CodeMirror-line " role="presentation"><span
                        role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                        class="cm-keyword">var</span> <span class="cm-def">dig</span> <span class="cm-operator">=</span> <span
                        class="cm-variable">Math</span>.<span class="cm-property">PI</span> <span
                        class="cm-operator">/</span> <span class="cm-number">6</span>;</span></pre></div><div
                        style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                        class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                        style="left: 0px; width: 29px;">10</div></div><pre class=" CodeMirror-line "
                                                                           role="presentation"><span role="presentation"
                                                                                                     style="padding-right: 0.1px;"> &nbsp;</span></pre></div><div
                        style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                        class="CodeMirror-linenumber CodeMirror-gutter-elt"
                        style="left: 0px; width: 29px;">11</div></div><pre class=" CodeMirror-line "
                                                                           role="presentation"><span role="presentation"
                                                                                                     style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                        class="cm-variable">ctx</span>.<span class="cm-property">moveTo</span>(<span
                        class="cm-variable">dx</span>,<span class="cm-variable">dy</span>);</span></pre></div><div
                        style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                        class="CodeMirror-linenumber CodeMirror-gutter-elt"
                        style="left: 0px; width: 29px;">12</div></div><pre class=" CodeMirror-line "
                                                                           role="presentation"><span role="presentation"
                                                                                                     style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                        class="cm-variable">ctx</span>.<span class="cm-property">beginPath</span>();</span></pre></div><div
                        style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                        class="CodeMirror-linenumber CodeMirror-gutter-elt"
                        style="left: 0px; width: 29px;">13</div></div><pre class=" CodeMirror-line "
                                                                           role="presentation"><span role="presentation"
                                                                                                     style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                        class="cm-keyword">for</span> (<span class="cm-keyword">var</span> <span class="cm-def">i</span> <span
                        class="cm-operator">=</span> <span class="cm-number">0</span>; <span
                        class="cm-variable-2">i</span> <span class="cm-operator">&lt;</span> <span
                        class="cm-number">9</span>; <span class="cm-variable-2">i</span><span
                        class="cm-operator">++</span>) {</span></pre></div><div style="position: relative;"><div
                        class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                        class="CodeMirror-linenumber CodeMirror-gutter-elt"
                        style="left: 0px; width: 29px;">14</div></div><pre class=" CodeMirror-line "
                                                                           role="presentation"><span role="presentation"
                                                                                                     style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp;<span
                        class="cm-keyword">var</span> <span class="cm-def">x</span> <span
                        class="cm-operator">=</span> <span class="cm-variable">r</span> <span
                        class="cm-operator">*</span> <span class="cm-variable">Math</span>.<span
                        class="cm-property">sin</span>(<span class="cm-variable-2">i</span> <span
                        class="cm-operator">*</span> <span class="cm-variable">dig</span>);</span></pre></div><div
                        style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                        class="CodeMirror-linenumber CodeMirror-gutter-elt"
                        style="left: 0px; width: 29px;">15</div></div><pre class=" CodeMirror-line "
                                                                           role="presentation"><span role="presentation"
                                                                                                     style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp;<span
                        class="cm-keyword">var</span> <span class="cm-def">y</span> <span
                        class="cm-operator">=</span> <span class="cm-variable">r</span> <span
                        class="cm-operator">*</span> <span class="cm-variable">Math</span>.<span
                        class="cm-property">cos</span>(<span class="cm-variable-2">i</span> <span
                        class="cm-operator">*</span> <span class="cm-variable">dig</span>);</span></pre></div><div
                        style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                        class="CodeMirror-linenumber CodeMirror-gutter-elt"
                        style="left: 0px; width: 29px;">16</div></div><pre class=" CodeMirror-line "
                                                                           role="presentation"><span role="presentation"
                                                                                                     style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp;<span
                        class="cm-variable">ctx</span>.<span class="cm-property">lineTo</span>(<span
                        class="cm-variable">dx</span> <span class="cm-operator">+</span> <span
                        class="cm-variable">x</span>, <span class="cm-variable">dy</span> <span
                        class="cm-operator">+</span> <span class="cm-variable">y</span>);</span></pre></div><div
                        style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                        class="CodeMirror-linenumber CodeMirror-gutter-elt"
                        style="left: 0px; width: 29px;">17</div></div><pre class=" CodeMirror-line "
                                                                           role="presentation"><span role="presentation"
                                                                                                     style="padding-right: 0.1px;"> &nbsp;  }</span></pre></div><div
                        style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                        class="CodeMirror-linenumber CodeMirror-gutter-elt"
                        style="left: 0px; width: 29px;">18</div></div><pre class=" CodeMirror-line "
                                                                           role="presentation"><span role="presentation"
                                                                                                     style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                        class="cm-variable">ctx</span>.<span class="cm-property">closePath</span>();</span></pre></div><div
                        style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                        class="CodeMirror-linenumber CodeMirror-gutter-elt"
                        style="left: 0px; width: 29px;">19</div></div><pre class=" CodeMirror-line "
                                                                           role="presentation"><span role="presentation"
                                                                                                     style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                        class="cm-variable">ctx</span>.<span class="cm-property">stroke</span>();</span></pre></div><div
                        style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                        class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                        style="left: 0px; width: 29px;">20</div></div><pre class=" CodeMirror-line "
                                                                           role="presentation"><span role="presentation"
                                                                                                     style="padding-right: 0.1px;"><span
                        class="cm-tag cm-bracket">&lt;/</span><span class="cm-tag">script</span><span
                        class="cm-tag cm-bracket">&gt;</span></span></pre></div></div></div></div></div></div><div
                        style="position: absolute; height: 0px; width: 1px; border-bottom-width: 0px; border-bottom-style: solid; border-bottom-color: transparent; top: 500px;"></div><div
                        class="CodeMirror-gutters" style="height: 500px;"><div
                        class="CodeMirror-gutter CodeMirror-linenumbers"
                        style="width: 37px;"></div></div></div></div></pre>
            </li>
            <li>
                <pre class="md-fences md-end-block md-fences-with-lineno ty-contain-cm modeLoaded" spellcheck="false"
                     lang="html" style="break-inside: unset;"><div
                        class="CodeMirror cm-s-inner cm-s-null-scroll CodeMirror-wrap" lang="html"><div
                        style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 10.5px; left: 46px;"><textarea
                        autocorrect="off" autocapitalize="off" spellcheck="false" tabindex="0"
                        style="position: absolute; bottom: -1em; padding: 0px; width: 1000px; height: 1em; outline: none;"></textarea></div><div
                        class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div
                        class="CodeMirror-gutter-filler" cm-not-content="true"></div><div class="CodeMirror-scroll"
                                                                                          tabindex="-1"><div
                        class="CodeMirror-sizer"
                        style="margin-left: 38px; margin-bottom: 0px; border-right-width: 0px; padding-right: 0px; padding-bottom: 0px;"><div
                        style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div
                        role="presentation" style="position: relative; outline: none;"><div class="CodeMirror-measure"><pre><span>xxxxxxxxxx</span></pre><div
                        class="CodeMirror-linenumber CodeMirror-gutter-elt"><div>20</div></div></div><div
                        class="CodeMirror-measure"></div><div style="position: relative; z-index: 1;"></div><div
                        class="CodeMirror-code" role="presentation" style=""><div class="CodeMirror-activeline"
                                                                                  style="position: relative;"><div
                        class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div
                        class="CodeMirror-gutter-background CodeMirror-activeline-gutter"
                        style="left: -38px; width: 38px;"></div><div
                        class="CodeMirror-gutter-wrapper CodeMirror-activeline-gutter" style="left: -38px;"><div
                        class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                        style="left: 0px; width: 29px;">1</div></div><pre class=" CodeMirror-line " role="presentation"><span
                        role="presentation" style="padding-right: 0.1px;"><span
                        class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">style</span><span
                        class="cm-tag cm-bracket">&gt;</span></span></pre></div><div style="position: relative;"><div
                        class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                        class="CodeMirror-linenumber CodeMirror-gutter-elt"
                        style="left: 0px; width: 29px;">2</div></div><pre class=" CodeMirror-line " role="presentation"><span
                        role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp;  [<span class="cm-tag">class</span> *= <span
                        class="cm-string">"col-"</span>] {</span></pre></div><div style="position: relative;"><div
                        class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                        class="CodeMirror-linenumber CodeMirror-gutter-elt"
                        style="left: 0px; width: 29px;">3</div></div><pre class=" CodeMirror-line " role="presentation"><span
                        role="presentation"
                        style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span
                        class="cm-property">padding</span>: <span class="cm-number">15px</span> <span class="cm-number">0</span>;</span></pre></div><div
                        style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                        class="CodeMirror-linenumber CodeMirror-gutter-elt"
                        style="left: 0px; width: 29px;">4</div></div><pre class=" CodeMirror-line " role="presentation"><span
                        role="presentation"
                        style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span
                        class="cm-property">border</span>: <span class="cm-number">1px</span> <span class="cm-atom">solid</span> <span
                        class="cm-keyword">black</span>;</span></pre></div><div style="position: relative;"><div
                        class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                        class="CodeMirror-linenumber CodeMirror-gutter-elt"
                        style="left: 0px; width: 29px;">5</div></div><pre class=" CodeMirror-line " role="presentation"><span
                        role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp;  }</span></pre></div><div
                        style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                        class="CodeMirror-linenumber CodeMirror-gutter-elt"
                        style="left: 0px; width: 29px;">6</div></div><pre class=" CodeMirror-line " role="presentation"><span
                        role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span class="cm-tag cm-bracket">&lt;/</span><span
                        class="cm-tag">style</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                        style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                        class="CodeMirror-linenumber CodeMirror-gutter-elt"
                        style="left: 0px; width: 29px;">7</div></div><pre class=" CodeMirror-line " role="presentation"><span
                        role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span class="cm-tag cm-bracket">&lt;</span><span
                        class="cm-tag">title</span><span class="cm-tag cm-bracket">&gt;</span>Document<span
                        class="cm-tag cm-bracket">&lt;/</span><span class="cm-tag">title</span><span
                        class="cm-tag cm-bracket">&gt;</span></span></pre></div><div style="position: relative;"><div
                        class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                        class="CodeMirror-linenumber CodeMirror-gutter-elt"
                        style="left: 0px; width: 29px;">8</div></div><pre class=" CodeMirror-line " role="presentation"><span
                        role="presentation" style="padding-right: 0.1px;"><span
                        class="cm-tag cm-bracket">&lt;/</span><span class="cm-tag cm-error">head</span><span
                        class="cm-tag cm-bracket cm-error">&gt;</span></span></pre></div><div
                        style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                        class="CodeMirror-linenumber CodeMirror-gutter-elt"
                        style="left: 0px; width: 29px;">9</div></div><pre class=" CodeMirror-line " role="presentation"><span
                        role="presentation" style="padding-right: 0.1px;"><span
                        class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">body</span><span
                        class="cm-tag cm-bracket">&gt;</span></span></pre></div><div style="position: relative;"><div
                        class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                        class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                        style="left: 0px; width: 29px;">10</div></div><pre class=" CodeMirror-line "
                                                                           role="presentation"><span role="presentation"
                                                                                                     style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                        class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">div</span> <span class="cm-attribute">class</span>=<span
                        class="cm-string">"container"</span><span
                        class="cm-tag cm-bracket">&gt;</span></span></pre></div><div style="position: relative;"><div
                        class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                        class="CodeMirror-linenumber CodeMirror-gutter-elt"
                        style="left: 0px; width: 29px;">11</div></div><pre class=" CodeMirror-line "
                                                                           role="presentation"><span role="presentation"
                                                                                                     style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp;<span
                        class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">div</span> <span class="cm-attribute">class</span>=<span
                        class="cm-string">"row"</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                        style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                        class="CodeMirror-linenumber CodeMirror-gutter-elt"
                        style="left: 0px; width: 29px;">12</div></div><pre class=" CodeMirror-line "
                                                                           role="presentation"><span role="presentation"
                                                                                                     style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span
                        class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">div</span> <span class="cm-attribute">class</span>=<span
                        class="cm-string">"col-lg-6 col-md-5"</span><span class="cm-tag cm-bracket">&gt;</span>A<span
                        class="cm-tag cm-bracket">&lt;/</span><span class="cm-tag">div</span><span
                        class="cm-tag cm-bracket">&gt;</span></span></pre></div><div style="position: relative;"><div
                        class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                        class="CodeMirror-linenumber CodeMirror-gutter-elt"
                        style="left: 0px; width: 29px;">13</div></div><pre class=" CodeMirror-line "
                                                                           role="presentation"><span role="presentation"
                                                                                                     style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span
                        class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">div</span> <span class="cm-attribute">class</span>=<span
                        class="cm-string">"col-lg-6 col-md-5"</span><span class="cm-tag cm-bracket">&gt;</span>B<span
                        class="cm-tag cm-bracket">&lt;/</span><span class="cm-tag">div</span><span
                        class="cm-tag cm-bracket">&gt;</span></span></pre></div><div style="position: relative;"><div
                        class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                        class="CodeMirror-linenumber CodeMirror-gutter-elt"
                        style="left: 0px; width: 29px;">14</div></div><pre class=" CodeMirror-line "
                                                                           role="presentation"><span role="presentation"
                                                                                                     style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp;<span
                        class="cm-tag cm-bracket">&lt;/</span><span class="cm-tag">div</span><span
                        class="cm-tag cm-bracket">&gt;</span></span></pre></div><div style="position: relative;"><div
                        class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                        class="CodeMirror-linenumber CodeMirror-gutter-elt"
                        style="left: 0px; width: 29px;">15</div></div><pre class=" CodeMirror-line "
                                                                           role="presentation"><span role="presentation"
                                                                                                     style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp;<span
                        class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">div</span> <span class="cm-attribute">class</span>=<span
                        class="cm-string">"row"</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                        style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                        class="CodeMirror-linenumber CodeMirror-gutter-elt"
                        style="left: 0px; width: 29px;">16</div></div><pre class=" CodeMirror-line "
                                                                           role="presentation"><span role="presentation"
                                                                                                     style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span
                        class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">div</span> <span class="cm-attribute">class</span>=<span
                        class="cm-string">"col-lg-5 col-md-6"</span><span class="cm-tag cm-bracket">&gt;</span>C<span
                        class="cm-tag cm-bracket">&lt;/</span><span class="cm-tag">div</span><span
                        class="cm-tag cm-bracket">&gt;</span></span></pre></div><div style="position: relative;"><div
                        class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                        class="CodeMirror-linenumber CodeMirror-gutter-elt"
                        style="left: 0px; width: 29px;">17</div></div><pre class=" CodeMirror-line "
                                                                           role="presentation"><span role="presentation"
                                                                                                     style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span
                        class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">div</span> <span class="cm-attribute">class</span>=<span
                        class="cm-string">"col-lg-5 col-md-6 col-lg-offset-2"</span><span
                        class="cm-tag cm-bracket">&gt;</span>D<span class="cm-tag cm-bracket">&lt;/</span><span
                        class="cm-tag">div</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                        style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                        class="CodeMirror-linenumber CodeMirror-gutter-elt"
                        style="left: 0px; width: 29px;">18</div></div><pre class=" CodeMirror-line "
                                                                           role="presentation"><span role="presentation"
                                                                                                     style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp;<span
                        class="cm-tag cm-bracket">&lt;/</span><span class="cm-tag">div</span><span
                        class="cm-tag cm-bracket">&gt;</span></span></pre></div><div style="position: relative;"><div
                        class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                        class="CodeMirror-linenumber CodeMirror-gutter-elt"
                        style="left: 0px; width: 29px;">19</div></div><pre class=" CodeMirror-line "
                                                                           role="presentation"><span role="presentation"
                                                                                                     style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                        class="cm-tag cm-bracket">&lt;/</span><span class="cm-tag">div</span><span
                        class="cm-tag cm-bracket">&gt;</span></span></pre></div><div style="position: relative;"><div
                        class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                        class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                        style="left: 0px; width: 29px;">20</div></div><pre class=" CodeMirror-line "
                                                                           role="presentation"><span role="presentation"
                                                                                                     style="padding-right: 0.1px;"><span
                        class="cm-tag cm-bracket">&lt;/</span><span class="cm-tag">body</span><span
                        class="cm-tag cm-bracket">&gt;</span></span></pre></div></div></div></div></div></div><div
                        style="position: absolute; height: 0px; width: 1px; border-bottom-width: 0px; border-bottom-style: solid; border-bottom-color: transparent; top: 500px;"></div><div
                        class="CodeMirror-gutters" style="height: 500px;"><div
                        class="CodeMirror-gutter CodeMirror-linenumbers"
                        style="width: 37px;"></div></div></div></div></pre>
            </li>
            <li><pre class="md-fences md-end-block md-fences-with-lineno ty-contain-cm modeLoaded" spellcheck="false"
                     lang="html" style="break-inside: unset;"><div
                    class="CodeMirror cm-s-inner cm-s-null-scroll CodeMirror-wrap" lang="html"><div
                    style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 10.5px; left: 46px;"><textarea
                    autocorrect="off" autocapitalize="off" spellcheck="false" tabindex="0"
                    style="position: absolute; bottom: -1em; padding: 0px; width: 1000px; height: 1em; outline: none;"></textarea></div><div
                    class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div
                    class="CodeMirror-gutter-filler" cm-not-content="true"></div><div class="CodeMirror-scroll"
                                                                                      tabindex="-1"><div
                    class="CodeMirror-sizer"
                    style="margin-left: 38px; margin-bottom: 0px; border-right-width: 0px; padding-right: 0px; padding-bottom: 0px;"><div
                    style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div
                    role="presentation" style="position: relative; outline: none;"><div class="CodeMirror-measure"><pre><span>xxxxxxxxxx</span></pre><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt"><div>48</div></div></div><div
                    class="CodeMirror-measure"></div><div style="position: relative; z-index: 1;"></div><div
                    class="CodeMirror-code" role="presentation" style=""><div class="CodeMirror-activeline"
                                                                              style="position: relative;"><div
                    class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div
                    class="CodeMirror-gutter-background CodeMirror-activeline-gutter"
                    style="left: -38px; width: 38px;"></div><div
                    class="CodeMirror-gutter-wrapper CodeMirror-activeline-gutter" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                    style="left: 0px; width: 29px;">1</div></div><pre class=" CodeMirror-line "
                                                                      role="presentation"><span role="presentation"
                                                                                                style="padding-right: 0.1px;"><span
                    class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">body</span><span
                    class="cm-tag cm-bracket">&gt;</span></span></pre></div><div style="position: relative;"><div
                    class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">2</div></div><pre
                    class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                        style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                    class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">h1</span><span class="cm-tag cm-bracket">&gt;</span>HTML5 Web存储API之数据遍历<span
                    class="cm-tag cm-bracket">&lt;/</span><span class="cm-tag">h1</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                    style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">3</div></div><pre
                    class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                        style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                    class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">hr</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                    style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">4</div></div><pre
                    class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                        style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                    class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">div</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                    style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">5</div></div><pre
                    class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                        style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp;<span
                    class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">label</span> <span class="cm-attribute">for</span>=<span
                    class="cm-string">"msg"</span><span class="cm-tag cm-bracket">&gt;</span>我的留言板<span
                    class="cm-tag cm-bracket">&lt;/</span><span class="cm-tag">label</span><span
                    class="cm-tag cm-bracket">&gt;</span></span></pre></div><div style="position: relative;"><div
                    class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">6</div></div><pre
                    class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                        style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                    class="cm-tag cm-bracket">&lt;/</span><span class="cm-tag">div</span><span
                    class="cm-tag cm-bracket">&gt;</span></span></pre></div><div style="position: relative;"><div
                    class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">7</div></div><pre
                    class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                        style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                    class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">textarea</span> <span
                    class="cm-attribute">id</span>=<span class="cm-string">"msg"</span><span class="cm-tag cm-bracket">&gt;&lt;/</span><span
                    class="cm-tag">textarea</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                    style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">8</div></div><pre
                    class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                        style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                    class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">div</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                    style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">9</div></div><pre
                    class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                        style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp;<span
                    class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">button</span> <span class="cm-attribute">id</span>=<span
                    class="cm-string">"submit"</span><span class="cm-tag cm-bracket">&gt;</span>提交留言<span
                    class="cm-tag cm-bracket">&lt;/</span><span class="cm-tag">button</span><span
                    class="cm-tag cm-bracket">&gt;</span></span></pre></div><div style="position: relative;"><div
                    class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                    style="left: 0px; width: 29px;">10</div></div><pre class=" CodeMirror-line "
                                                                       role="presentation"><span role="presentation"
                                                                                                 style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                    class="cm-tag cm-bracket">&lt;/</span><span class="cm-tag">div</span><span
                    class="cm-tag cm-bracket">&gt;</span></span></pre></div><div style="position: relative;"><div
                    class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">11</div></div><pre
                    class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                        style="padding-right: 0.1px;"><span cm-text=""
                                                                                                            cm-zwsp="">
</span></span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">12</div></div><pre
                    class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                        style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                    class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">ol</span> <span
                    class="cm-attribute">id</span>=<span class="cm-string">"comments"</span><span
                    class="cm-tag cm-bracket">&gt;</span></span></pre></div><div style="position: relative;"><div
                    class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">13</div></div><pre
                    class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                        style="padding-right: 0.1px;"><span cm-text=""
                                                                                                            cm-zwsp="">
</span></span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">14</div></div><pre
                    class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                        style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                    class="cm-tag cm-bracket">&lt;/</span><span class="cm-tag">ol</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                    style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">15</div></div><pre
                    class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                        style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                    class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">script</span><span
                    class="cm-tag cm-bracket">&gt;</span></span></pre></div><div style="position: relative;"><div
                    class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">16</div></div><pre
                    class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                        style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp;<span
                    class="cm-keyword">var</span> <span class="cm-def">allComments</span> <span
                    class="cm-operator">=</span> <span class="cm-variable">document</span>.<span class="cm-property">getElementById</span>(<span
                    class="cm-string">'comments'</span>);</span></pre></div><div style="position: relative;"><div
                    class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">17</div></div><pre
                    class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                        style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp;<span
                    class="cm-variable">getAll</span>();</span></pre></div><div style="position: relative;"><div
                    class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">18</div></div><pre
                    class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                        style="padding-right: 0.1px;"><span cm-text=""
                                                                                                            cm-zwsp="">
</span></span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">19</div></div><pre
                    class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                        style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp;<span
                    class="cm-keyword">function</span> <span class="cm-def">getAll</span>() {</span></pre></div><div
                    style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                    style="left: 0px; width: 29px;">20</div></div><pre class=" CodeMirror-line "
                                                                       role="presentation"><span role="presentation"
                                                                                                 style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span
                    class="cm-keyword">var</span> <span class="cm-def">num</span> <span
                    class="cm-operator">=</span> <span class="cm-variable">localStorage</span>.<span
                    class="cm-property">length</span>;</span></pre></div><div style="position: relative;"><div
                    class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">21</div></div><pre
                    class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                        style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span
                    class="cm-keyword">if</span> (<span class="cm-variable-2">num</span> <span
                    class="cm-operator">===</span> <span class="cm-number">0</span>){</span></pre></div><div
                    style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">22</div></div><pre
                    class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                        style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span
                    class="cm-variable">allComments</span>.<span class="cm-property">innerHTML</span> <span
                    class="cm-operator">=</span> <span class="cm-string">"暂无留言"</span>;</span></pre></div><div
                    style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">23</div></div><pre
                    class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                        style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;  }<span
                    class="cm-keyword">else</span> {</span></pre></div><div style="position: relative;"><div
                    class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">24</div></div><pre
                    class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                        style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span
                    class="cm-variable">allComments</span>.<span class="cm-property">innerHTML</span> <span
                    class="cm-operator">=</span> <span class="cm-string">""</span>;</span></pre></div><div
                    style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">25</div></div><pre
                    class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                        style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span
                    class="cm-keyword">for</span> (<span class="cm-keyword">var</span> <span
                    class="cm-def">i</span> <span class="cm-operator">=</span> <span class="cm-number">0</span>; <span
                    class="cm-variable-2">i</span> <span class="cm-operator">&lt;</span> <span
                    class="cm-variable-2">num</span>; <span class="cm-variable-2">i</span><span
                    class="cm-operator">++</span>) {</span></pre></div><div style="position: relative;"><div
                    class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">26</div></div><pre
                    class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                        style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span
                    class="cm-keyword">var</span> <span class="cm-def">x</span> &nbsp;<span class="cm-operator">=</span> <span
                    class="cm-variable">document</span>.<span class="cm-property">createElement</span>(<span
                    class="cm-string">'li'</span>);</span></pre></div><div style="position: relative;"><div
                    class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">27</div></div><pre
                    class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                        style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span
                    class="cm-keyword">var</span> <span class="cm-def">name</span> <span
                    class="cm-operator">=</span> <span class="cm-variable">localStorage</span>.<span
                    class="cm-property">key</span>(<span class="cm-variable-2">i</span>);</span></pre></div><div
                    style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">28</div></div><pre
                    class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                        style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span
                    class="cm-variable">console</span>.<span class="cm-property">log</span>(<span class="cm-variable-2">name</span>)</span></pre></div><div
                    style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">29</div></div><pre
                    class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                        style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span
                    class="cm-variable-2">x</span>.<span class="cm-property">innerHTML</span> <span class="cm-operator">=</span> <span
                    class="cm-variable">localStorage</span>.<span class="cm-property">getItem</span>(<span
                    class="cm-variable-2">name</span>);</span></pre></div><div style="position: relative;"><div
                    class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                    style="left: 0px; width: 29px;">30</div></div><pre class=" CodeMirror-line "
                                                                       role="presentation"><span role="presentation"
                                                                                                 style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span
                    class="cm-variable">allComments</span>.<span class="cm-property">appendChild</span>(<span
                    class="cm-variable-2">x</span>);</span></pre></div><div style="position: relative;"><div
                    class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">31</div></div><pre
                    class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                        style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;  }</span></pre></div><div
                    style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">32</div></div><pre
                    class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                        style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;  }</span></pre></div><div
                    style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">33</div></div><pre
                    class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                        style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp;  }</span></pre></div><div
                    style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">34</div></div><pre
                    class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                        style="padding-right: 0.1px;"><span cm-text=""
                                                                                                            cm-zwsp="">
</span></span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">35</div></div><pre
                    class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                        style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp;<span
                    class="cm-keyword">function</span> <span class="cm-def">saveComment</span> () {</span></pre></div><div
                    style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">36</div></div><pre
                    class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                        style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span
                    class="cm-keyword">var</span> <span class="cm-def">comment</span> <span class="cm-operator">=</span> <span
                    class="cm-variable">document</span>.<span class="cm-property">getElementById</span>(<span
                    class="cm-string">'msg'</span>);</span></pre></div><div style="position: relative;"><div
                    class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">37</div></div><pre
                    class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                        style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span
                    class="cm-keyword">var</span> <span class="cm-def">myDate</span> <span class="cm-operator">=</span> <span
                    class="cm-keyword">new</span> <span class="cm-variable">Date</span>();</span></pre></div><div
                    style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">38</div></div><pre
                    class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                        style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span
                    class="cm-variable">localStorage</span>.<span class="cm-property">setItem</span>(<span
                    class="cm-variable-2">myDate</span>.<span class="cm-property">toString</span>(), <span
                    class="cm-variable-2">comment</span>.<span class="cm-property">value</span>);</span></pre></div><div
                    style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">39</div></div><pre
                    class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                        style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp;  }</span></pre></div><div
                    style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                    style="left: 0px; width: 29px;">40</div></div><pre class=" CodeMirror-line "
                                                                       role="presentation"><span role="presentation"
                                                                                                 style="padding-right: 0.1px;"><span
                    cm-text="" cm-zwsp="">
</span></span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">41</div></div><pre
                    class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                        style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp;<span
                    class="cm-keyword">var</span> <span class="cm-def">btn</span> <span
                    class="cm-operator">=</span> <span class="cm-variable">document</span>.<span class="cm-property">getElementById</span>(<span
                    class="cm-string">'submit'</span>);</span></pre></div><div style="position: relative;"><div
                    class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">42</div></div><pre
                    class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                        style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp;<span
                    class="cm-variable">btn</span>.<span class="cm-property">onclick</span> <span
                    class="cm-operator">=</span> <span class="cm-keyword">function</span> () {</span></pre></div><div
                    style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">43</div></div><pre
                    class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                        style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span
                    class="cm-variable">console</span>.<span class="cm-property">log</span>(<span
                    class="cm-number">123</span>)</span></pre></div><div style="position: relative;"><div
                    class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">44</div></div><pre
                    class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                        style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span
                    class="cm-variable">saveComment</span>();</span></pre></div><div style="position: relative;"><div
                    class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">45</div></div><pre
                    class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                        style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span
                    class="cm-variable">getAll</span>();</span></pre></div><div style="position: relative;"><div
                    class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">46</div></div><pre
                    class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                        style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp;  }</span></pre></div><div
                    style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">47</div></div><pre
                    class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                        style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                    class="cm-tag cm-bracket">&lt;/</span><span class="cm-tag">script</span><span
                    class="cm-tag cm-bracket">&gt;</span></span></pre></div><div style="position: relative;"><div
                    class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                    class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                    style="left: 0px; width: 29px;">48</div></div><pre class=" CodeMirror-line "
                                                                       role="presentation"><span role="presentation"
                                                                                                 style="padding-right: 0.1px;"><span
                    class="cm-tag cm-bracket">&lt;/</span><span class="cm-tag">body</span><span
                    class="cm-tag cm-bracket">&gt;</span></span></pre></div></div></div></div></div></div><div
                    style="position: absolute; height: 0px; width: 1px; border-bottom-width: 0px; border-bottom-style: solid; border-bottom-color: transparent; top: 1200px;"></div><div
                    class="CodeMirror-gutters" style="height: 1200px;"><div
                    class="CodeMirror-gutter CodeMirror-linenumbers" style="width: 37px;"></div></div></div></div></pre>
            </li>
        </ol>
        <h3 id='四编程题'><span>四、编程题</span></h3>
        <p><span>1、网页文件login.html页面效果如图所示， 图片验证码由四个字母图片随机生成，当单击图片验证码时，可以更换一组验证码。写出实现该功能的jQuery 代码。</span></p>
        <p><img style="width: 300px" src="./img.png" referrerpolicy="no-referrer"
                alt="image-20211209200456635"></p>
        <p><span>说明：</span></p>
        <p><span>（1） 图片文件是26个字母的大小写图片，保存在与login.html同一目录的img文件夹内， 文件以数字命名，分别为l.png 、2.png ……、52.png。</span></p>
        <p><span>（2）文件jQuery-12.3.min.js保存在与login.html同一目录的js文件夹内。</span></p>
        <p><span>（3）网页样式请忽略，body中静态部分代码已给出，写出jQuery代码。</span></p>
        <pre class="md-fences md-end-block md-fences-with-lineno ty-contain-cm modeLoaded" spellcheck="false"
             lang="html" style="break-inside: unset;"><div
                class="CodeMirror cm-s-inner cm-s-null-scroll CodeMirror-wrap" lang="html"><div
                style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 10.5px; left: 46px;"><textarea
                autocorrect="off" autocapitalize="off" spellcheck="false" tabindex="0"
                style="position: absolute; bottom: -1em; padding: 0px; width: 1000px; height: 1em; outline: none;"></textarea></div><div
                class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div class="CodeMirror-gutter-filler"
                                                                                     cm-not-content="true"></div><div
                class="CodeMirror-scroll" tabindex="-1"><div class="CodeMirror-sizer"
                                                             style="margin-left: 38px; margin-bottom: 0px; border-right-width: 0px; padding-right: 0px; padding-bottom: 0px;"><div
                style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div
                role="presentation" style="position: relative; outline: none;"><div class="CodeMirror-measure"><pre><span>xxxxxxxxxx</span></pre><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt"><div>22</div></div></div><div
                class="CodeMirror-measure"></div><div style="position: relative; z-index: 1;"></div><div
                class="CodeMirror-code" role="presentation" style=""><div class="CodeMirror-activeline"
                                                                          style="position: relative;"><div
                class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div
                class="CodeMirror-gutter-background CodeMirror-activeline-gutter"
                style="left: -38px; width: 38px;"></div><div
                class="CodeMirror-gutter-wrapper CodeMirror-activeline-gutter" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 29px;">1</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;"><span class="cm-tag cm-bracket">&lt;</span><span
                class="cm-tag">body</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">2</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span
                class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">div</span> <span
                class="cm-attribute">class</span>=<span class="cm-string">"v-code"</span><span
                class="cm-tag cm-bracket">&gt;</span></span></pre></div><div style="position: relative;"><div
                class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">3</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">img</span> <span
                class="cm-attribute">src</span>=<span class="cm-string">""</span> <span class="cm-attribute">alt</span>=<span
                class="cm-string">""</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">4</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">img</span> <span
                class="cm-attribute">src</span>=<span class="cm-string">""</span> <span class="cm-attribute">alt</span>=<span
                class="cm-string">""</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">5</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">img</span> <span
                class="cm-attribute">src</span>=<span class="cm-string">""</span> <span class="cm-attribute">alt</span>=<span
                class="cm-string">""</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">6</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">img</span> <span
                class="cm-attribute">src</span>=<span class="cm-string">""</span> <span class="cm-attribute">alt</span>=<span
                class="cm-string">""</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">7</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span
                class="cm-tag cm-bracket">&lt;/</span><span class="cm-tag">div</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">8</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span
                class="cm-tag cm-bracket">&lt;/</span><span class="cm-tag">body</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">9</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span
                class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">script</span> <span
                class="cm-attribute">src</span>=<span class="cm-string">"./js/jQuery-12.3.js"</span><span
                class="cm-tag cm-bracket">&gt;&lt;/</span><span class="cm-tag">script</span><span
                class="cm-tag cm-bracket">&gt;</span></span></pre></div><div style="position: relative;"><div
                class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 29px;">10</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;"><span class="cm-tag cm-bracket">&lt;</span><span
                class="cm-tag">script</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">11</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-variable">changeVCode</span>();</span></pre></div><div style="position: relative;"><div
                class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">12</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-variable">$</span>(<span class="cm-string">'.v-code'</span>).<span
                class="cm-property">click</span>(<span class="cm-keyword">function</span>(<span class="cm-def">e</span>) {</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">13</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp;<span
                class="cm-variable">changeVCode</span>();</span></pre></div><div style="position: relative;"><div
                class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">14</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp;  });</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">15</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span cm-text=""
                                                                                                        cm-zwsp="">
</span></span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">16</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-keyword">function</span> <span class="cm-def">changeVCode</span>() {</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">17</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp;<span
                class="cm-keyword">var</span> <span class="cm-def">imgs</span> <span class="cm-operator">=</span> &nbsp;<span
                class="cm-variable">$</span>(<span class="cm-string">'img'</span>);</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">18</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp;<span
                class="cm-keyword">for</span> (<span class="cm-keyword">let</span> <span class="cm-def">i</span> <span
                class="cm-operator">=</span> <span class="cm-number">0</span>; <span
                class="cm-variable-2">i</span> <span class="cm-operator">&lt;</span> <span
                class="cm-variable-2">imgs</span>.<span class="cm-property">length</span>; <span
                class="cm-variable-2">i</span><span class="cm-operator">++</span>) {</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">19</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span
                class="cm-variable">$</span>(<span class="cm-variable-2">imgs</span>[<span
                class="cm-variable-2">i</span>]).<span class="cm-property">attr</span>(<span
                class="cm-string">'src'</span>,<span class="cm-variable">Math</span>.<span
                class="cm-property">floor</span>(<span class="cm-variable">Math</span>.<span
                class="cm-property">random</span>() <span class="cm-operator">*</span> <span class="cm-number">52</span>) <span
                class="cm-operator">+</span> <span class="cm-number">1</span> <span class="cm-operator">+</span> <span
                class="cm-string">'.png'</span>);</span></pre></div><div style="position: relative;"><div
                class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 29px;">20</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp;  }</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">21</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp;  }</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 29px;">22</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;"><span class="cm-tag cm-bracket">&lt;/</span><span
                class="cm-tag">script</span><span
                class="cm-tag cm-bracket">&gt;</span></span></pre></div></div></div></div></div></div><div
                style="position: absolute; height: 0px; width: 1px; border-bottom-width: 0px; border-bottom-style: solid; border-bottom-color: transparent; top: 550px;"></div><div
                class="CodeMirror-gutters" style="height: 550px;"><div class="CodeMirror-gutter CodeMirror-linenumbers"
                                                                       style="width: 37px;"></div></div></div></div></pre>
        <p><span>2、网页文件exp.html页面效果如图所示，点击”添加背景色“按钮，为矩形框区域（div）添加背景色；单击”移除背景色“按钮，删除矩形框区域的背景色；单击 ”背景色自动切换“按钮，矩形框区域背景色可添加或删除。网页头部及CSS初始代码请忽略，body中静态部分代码已给出，写出实现上述功能的全部代码。</span>
        </p>
        <p><img src="./img_5.png"
                referrerpolicy="no-referrer" alt="image-20211202220105383"></p>
        <pre class="md-fences md-end-block md-fences-with-lineno ty-contain-cm modeLoaded" spellcheck="false"
             lang="html" style="break-inside: unset;"><div
                class="CodeMirror cm-s-inner cm-s-null-scroll CodeMirror-wrap" lang="html"><div
                style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 10.5px; left: 46px;"><textarea
                autocorrect="off" autocapitalize="off" spellcheck="false" tabindex="0"
                style="position: absolute; bottom: -1em; padding: 0px; width: 1000px; height: 1em; outline: none;"></textarea></div><div
                class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div class="CodeMirror-gutter-filler"
                                                                                     cm-not-content="true"></div><div
                class="CodeMirror-scroll" tabindex="-1"><div class="CodeMirror-sizer"
                                                             style="margin-left: 38px; margin-bottom: 0px; border-right-width: 0px; padding-right: 0px; padding-bottom: 0px;"><div
                style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div
                role="presentation" style="position: relative; outline: none;"><div class="CodeMirror-measure"><pre><span>xxxxxxxxxx</span></pre><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt"><div>34</div></div></div><div
                class="CodeMirror-measure"></div><div style="position: relative; z-index: 1;"></div><div
                class="CodeMirror-code" role="presentation" style=""><div class="CodeMirror-activeline"
                                                                          style="position: relative;"><div
                class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div
                class="CodeMirror-gutter-background CodeMirror-activeline-gutter"
                style="left: -38px; width: 38px;"></div><div
                class="CodeMirror-gutter-wrapper CodeMirror-activeline-gutter" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 29px;">1</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;"><span class="cm-tag cm-bracket">&lt;</span><span
                class="cm-tag">head</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">2</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">style</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">3</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp;<span
                class="cm-qualifier">.bgColor</span> {</span></pre></div><div style="position: relative;"><div
                class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">4</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span
                class="cm-property">background-color</span>: <span class="cm-keyword">red</span>;</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">5</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp;  }</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">6</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-tag cm-bracket">&lt;/</span><span class="cm-tag">style</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">7</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span
                class="cm-tag cm-bracket">&lt;/</span><span class="cm-tag">head</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">8</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span
                class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">body</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">9</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">div</span> <span
                class="cm-attribute">class</span>=<span class="cm-string">"show"</span><span class="cm-tag cm-bracket">&gt;&lt;/</span><span
                class="cm-tag">div</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 29px;">10</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">div</span> <span
                class="cm-attribute">class</span>=<span class="cm-string">"control"</span><span
                class="cm-tag cm-bracket">&gt;</span></span></pre></div><div style="position: relative;"><div
                class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">11</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp;<span
                class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">button</span><span class="cm-tag cm-bracket">&gt;</span>添加背景色<span
                class="cm-tag cm-bracket">&lt;/</span><span class="cm-tag">button</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">12</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp;<span
                class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">button</span><span class="cm-tag cm-bracket">&gt;</span>移除背景色<span
                class="cm-tag cm-bracket">&lt;/</span><span class="cm-tag">button</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">13</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp;<span
                class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">button</span><span class="cm-tag cm-bracket">&gt;</span>背景色自动切换<span
                class="cm-tag cm-bracket">&lt;/</span><span class="cm-tag">button</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">14</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-tag cm-bracket">&lt;/</span><span class="cm-tag">div</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">15</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">script</span> <span
                class="cm-attribute">src</span>=<span class="cm-string">"./js/jQuery-12.3.js"</span><span
                class="cm-tag cm-bracket">&gt;&lt;/</span><span class="cm-tag">script</span><span
                class="cm-tag cm-bracket">&gt;</span></span></pre></div><div style="position: relative;"><div
                class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">16</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">script</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">17</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp;<span
                class="cm-keyword">var</span> <span class="cm-def">div</span> <span class="cm-operator">=</span> <span
                class="cm-variable">$</span>(<span class="cm-string">'.show'</span>);</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">18</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp;<span
                class="cm-keyword">var</span> <span class="cm-def">btn1</span> <span class="cm-operator">=</span> <span
                class="cm-variable">$</span>(<span class="cm-string">'button:eq(0)'</span>);</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">19</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp;<span
                class="cm-keyword">var</span> <span class="cm-def">btn2</span> <span class="cm-operator">=</span> <span
                class="cm-variable">$</span>(<span class="cm-string">'button:eq(1)'</span>);</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 29px;">20</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp;<span class="cm-keyword">var</span> <span
                class="cm-def">btn3</span> <span class="cm-operator">=</span> <span class="cm-variable">$</span>(<span
                class="cm-string">'button:eq(2)'</span>);</span></pre></div><div style="position: relative;"><div
                class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">21</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span cm-text=""
                                                                                                        cm-zwsp="">
</span></span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">22</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp;<span
                class="cm-variable">btn1</span>.<span class="cm-property">click</span>(<span
                class="cm-keyword">function</span> () {</span></pre></div><div style="position: relative;"><div
                class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">23</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span
                class="cm-variable">div</span>.<span class="cm-property">addClass</span>(<span class="cm-string">'bgColor'</span>);</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">24</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp;  });</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">25</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span cm-text=""
                                                                                                        cm-zwsp="">
</span></span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">26</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp;<span
                class="cm-variable">btn2</span>.<span class="cm-property">click</span>(<span
                class="cm-keyword">function</span> () {</span></pre></div><div style="position: relative;"><div
                class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">27</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span
                class="cm-variable">div</span>.<span class="cm-property">removeClass</span>(<span class="cm-string">'bgColor'</span>);</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">28</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp;  });</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">29</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation"
                                                                    style="padding-right: 0.1px;"><span cm-text=""
                                                                                                        cm-zwsp="">
</span></span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 29px;">30</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp;<span class="cm-variable">btn3</span>.<span
                class="cm-property">click</span>(<span class="cm-keyword">function</span> () {</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">31</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span
                class="cm-variable">div</span>.<span class="cm-property">toggleClass</span>(<span class="cm-string">'bgColor'</span>);</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">32</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp; &nbsp;  });</span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 29px;">33</div></div><pre
                class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span
                class="cm-tag cm-bracket">&lt;/</span><span class="cm-tag">script</span><span class="cm-tag cm-bracket">&gt;</span></span></pre></div><div
                style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -38px;"><div
                class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show"
                style="left: 0px; width: 29px;">34</div></div><pre class=" CodeMirror-line " role="presentation"><span
                role="presentation" style="padding-right: 0.1px;"><span class="cm-tag cm-bracket">&lt;/</span><span
                class="cm-tag">body</span><span
                class="cm-tag cm-bracket">&gt;</span></span></pre></div></div></div></div></div></div><div
                style="position: absolute; height: 0px; width: 1px; border-bottom-width: 0px; border-bottom-style: solid; border-bottom-color: transparent; top: 850px;"></div><div
                class="CodeMirror-gutters" style="height: 850px;"><div class="CodeMirror-gutter CodeMirror-linenumbers"
                                                                       style="width: 37px;"></div></div></div></div></pre>
        <p>&nbsp;</p></div>
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